comparison core.js @ 1106:282dfb8076f5

Merge default to dev_main

+/**
+ * core.js
+ * 
+ * Main script to run, calls all other core functions and manages loading/store to backend.
+ * Also contains all global variables.
+ */
+
+/* create the web audio API context and store in audioContext*/
+var audioContext; // Hold the browser web audio API
+var projectXML; // Hold the parsed setup XML
+var schemaXSD; // Hold the parsed schema XSD
+var specification;
+var interfaceContext;
+var storage;
+var popup; // Hold the interfacePopup object
+var testState;
+var currentTrackOrder = []; // Hold the current XML tracks in their (randomised) order
+var audioEngineContext; // The custome AudioEngine object
+var projectReturn; // Hold the URL for the return
+
+
+// Add a prototype to the bufferSourceNode to reference to the audioObject holding it
+AudioBufferSourceNode.prototype.owner = undefined;
+// Add a prototype to the bufferNode to hold the desired LINEAR gain
+AudioBuffer.prototype.playbackGain = undefined;
+// Add a prototype to the bufferNode to hold the computed LUFS loudness
+AudioBuffer.prototype.lufs = undefined;
+
+// Firefox does not have an XMLDocument.prototype.getElementsByName
+// and there is no searchAll style command, this custom function will
+// search all children recusrively for the name. Used for XSD where all
+// element nodes must have a name and therefore can pull the schema node
+XMLDocument.prototype.getAllElementsByName = function(name)
+{
+    name = String(name);
+    var selected = this.documentElement.getAllElementsByName(name);
+    return selected;
+}
+
+Element.prototype.getAllElementsByName = function(name)
+{
+    name = String(name);
+    var selected = [];
+    var node = this.firstElementChild;
+    while(node != null)
+    {
+        if (node.getAttribute('name') == name)
+        {
+            selected.push(node);
+        }
+        if (node.childElementCount > 0)
+        {
+            selected = selected.concat(node.getAllElementsByName(name));
+        }
+        node = node.nextElementSibling;
+    }
+    return selected;
+}
+
+XMLDocument.prototype.getAllElementsByTagName = function(name)
+{
+    name = String(name);
+    var selected = this.documentElement.getAllElementsByTagName(name);
+    return selected;
+}
+
+Element.prototype.getAllElementsByTagName = function(name)
+{
+    name = String(name);
+    var selected = [];
+    var node = this.firstElementChild;
+    while(node != null)
+    {
+        if (node.nodeName == name)
+        {
+            selected.push(node);
+        }
+        if (node.childElementCount > 0)
+        {
+            selected = selected.concat(node.getAllElementsByTagName(name));
+        }
+        node = node.nextElementSibling;
+    }
+    return selected;
+}
+
+// Firefox does not have an XMLDocument.prototype.getElementsByName
+if (typeof XMLDocument.prototype.getElementsByName != "function") {
+    XMLDocument.prototype.getElementsByName = function(name)
+    {
+        name = String(name);
+        var node = this.documentElement.firstElementChild;
+        var selected = [];
+        while(node != null)
+        {
+            if (node.getAttribute('name') == name)
+            {
+                selected.push(node);
+            }
+            node = node.nextElementSibling;
+        }
+        return selected;
+    }
+}
+
+window.onload = function() {
+	// Function called once the browser has loaded all files.
+	// This should perform any initial commands such as structure / loading documents
+	
+	// Create a web audio API context
+	// Fixed for cross-browser support
+	var AudioContext = window.AudioContext || window.webkitAudioContext;
+	audioContext = new AudioContext;
+	
+	// Create test state
+	testState = new stateMachine();
+	
+	// Create the popup interface object
+	popup = new interfacePopup();
+    
+    // Create the specification object
+	specification = new Specification();
+	
+	// Create the interface object
+	interfaceContext = new Interface(specification);
+	
+	// Create the storage object
+	storage = new Storage();
+	// Define window callbacks for interface
+	window.onresize = function(event){interfaceContext.resizeWindow(event);};
+};
+
+function loadProjectSpec(url) {
+	// Load the project document from the given URL, decode the XML and instruct audioEngine to get audio data
+	// If url is null, request client to upload project XML document
+	var xmlhttp = new XMLHttpRequest();
+	xmlhttp.open("GET",'test-schema.xsd',true);
+	xmlhttp.onload = function()
+	{
+		schemaXSD = xmlhttp.response;
+		var parse = new DOMParser();
+		specification.schema = parse.parseFromString(xmlhttp.response,'text/xml');
+		var r = new XMLHttpRequest();
+		r.open('GET',url,true);
+		r.onload = function() {
+			loadProjectSpecCallback(r.response);
+		};
+		r.send();
+	};
+	xmlhttp.send();
+};
+
+function loadProjectSpecCallback(response) {
+	// Function called after asynchronous download of XML project specification
+	//var decode = $.parseXML(response);
+	//projectXML = $(decode);
+	
+	// First perform XML schema validation
+	var Module = {
+		xml: response,
+		schema: schemaXSD,
+		arguments:["--noout", "--schema", 'test-schema.xsd','document.xml']
+	};
+	
+	var xmllint = validateXML(Module);
+	console.log(xmllint);
+	if(xmllint != 'document.xml validates\n')
+	{
+		document.getElementsByTagName('body')[0].innerHTML = null;
+		var msg = document.createElement("h3");
+		msg.textContent = "FATAL ERROR";
+		var span = document.createElement("h4");
+		span.textContent = "The XML validator returned the following errors when decoding your XML file";
+		document.getElementsByTagName('body')[0].appendChild(msg);
+		document.getElementsByTagName('body')[0].appendChild(span);
+		xmllint = xmllint.split('\n');
+		for (var i in xmllint)
+		{
+			document.getElementsByTagName('body')[0].appendChild(document.createElement('br'));
+			var span = document.createElement("span");
+			span.textContent = xmllint[i];
+			document.getElementsByTagName('body')[0].appendChild(span);
+		}
+		return;
+	}
+	
+	var parse = new DOMParser();
+	projectXML = parse.parseFromString(response,'text/xml');
+	var errorNode = projectXML.getElementsByTagName('parsererror');
+	if (errorNode.length >= 1)
+	{
+		var msg = document.createElement("h3");
+		msg.textContent = "FATAL ERROR";
+		var span = document.createElement("span");
+		span.textContent = "The XML parser returned the following errors when decoding your XML file";
+		document.getElementsByTagName('body')[0].innerHTML = null;
+		document.getElementsByTagName('body')[0].appendChild(msg);
+		document.getElementsByTagName('body')[0].appendChild(span);
+		document.getElementsByTagName('body')[0].appendChild(errorNode[0]);
+		return;
+	}
+	
+	// Build the specification
+	specification.decode(projectXML);
+	storage.initialise();
+	/// CHECK FOR SAMPLE RATE COMPATIBILITY
+	if (specification.sampleRate != undefined) {
+		if (Number(specification.sampleRate) != audioContext.sampleRate) {
+			var errStr = 'Sample rates do not match! Requested '+Number(specification.sampleRate)+', got '+audioContext.sampleRate+'. Please set the sample rate to match before completing this test.';
+			alert(errStr);
+			return;
+		}
+	}
+	
+	// Detect the interface to use and load the relevant javascripts.
+	var interfaceJS = document.createElement('script');
+	interfaceJS.setAttribute("type","text/javascript");
+	switch(specification.interface)
+	{
+		case "APE":
+		interfaceJS.setAttribute("src","interfaces/ape.js");
+		
+		// APE comes with a css file
+		var css = document.createElement('link');
+		css.rel = 'stylesheet';
+		css.type = 'text/css';
+		css.href = 'interfaces/ape.css';
+		
+		document.getElementsByTagName("head")[0].appendChild(css);
+		break;
+		
+		case "MUSHRA":
+		interfaceJS.setAttribute("src","interfaces/mushra.js");
+		
+		// MUSHRA comes with a css file
+		var css = document.createElement('link');
+		css.rel = 'stylesheet';
+		css.type = 'text/css';
+		css.href = 'interfaces/mushra.css';
+		
+		document.getElementsByTagName("head")[0].appendChild(css);
+		break;
+		
+		case "AB":
+		interfaceJS.setAttribute("src","interfaces/AB.js");
+		
+		// AB comes with a css file
+		var css = document.createElement('link');
+		css.rel = 'stylesheet';
+		css.type = 'text/css';
+		css.href = 'interfaces/AB.css';
+		
+		document.getElementsByTagName("head")[0].appendChild(css);
+		break;
+		case "Bipolar":
+		case "ACR":
+		case "DCR":
+		case "CCR":
+		case "ABC":
+		// Above enumerate to horizontal sliders
+		interfaceJS.setAttribute("src","interfaces/horizontal-sliders.js");
+		
+		// horizontal-sliders comes with a css file
+		var css = document.createElement('link');
+		css.rel = 'stylesheet';
+		css.type = 'text/css';
+		css.href = 'interfaces/horizontal-sliders.css';
+		
+		document.getElementsByTagName("head")[0].appendChild(css);
+		break;
+		case "discrete":
+		case "likert":
+		// Above enumerate to horizontal discrete radios
+		interfaceJS.setAttribute("src","interfaces/discrete.js");
+		
+		// horizontal-sliders comes with a css file
+		var css = document.createElement('link');
+		css.rel = 'stylesheet';
+		css.type = 'text/css';
+		css.href = 'interfaces/discrete.css';
+		
+		document.getElementsByTagName("head")[0].appendChild(css);
+		break;
+	}
+	document.getElementsByTagName("head")[0].appendChild(interfaceJS);
+	
+	// Create the audio engine object
+	audioEngineContext = new AudioEngine(specification);
+	
+	$(specification.pages).each(function(index,elem){
+		$(elem.audioElements).each(function(i,audioElem){
+			var URL = elem.hostURL + audioElem.url;
+			var buffer = null;
+			for (var i=0; i<audioEngineContext.buffers.length; i++)
+			{
+				if (URL == audioEngineContext.buffers[i].url)
+				{
+					buffer = audioEngineContext.buffers[i];
+					break;
+				}
+			}
+			if (buffer == null)
+			{
+				buffer = new audioEngineContext.bufferObj();
+				buffer.getMedia(URL);
+				audioEngineContext.buffers.push(buffer);
+			}
+		});
+	});
+}
+
+function createProjectSave(destURL) {
+	// Save the data from interface into XML and send to destURL
+	// If destURL is null then download XML in client
+	// Now time to render file locally
+	var xmlDoc = interfaceXMLSave();
+	var parent = document.createElement("div");
+	parent.appendChild(xmlDoc);
+	var file = [parent.innerHTML];
+	if (destURL == "null" || destURL == undefined) {
+		var bb = new Blob(file,{type : 'application/xml'});
+		var dnlk = window.URL.createObjectURL(bb);
+		var a = document.createElement("a");
+		a.hidden = '';
+		a.href = dnlk;
+		a.download = "save.xml";
+		a.textContent = "Save File";
+		
+		popup.showPopup();
+		popup.popupContent.innerHTML = "</span>Please save the file below to give to your test supervisor</span><br>";
+		popup.popupContent.appendChild(a);
+	} else {
+		var xmlhttp = new XMLHttpRequest;
+		xmlhttp.open("POST",destURL,true);
+		xmlhttp.setRequestHeader('Content-Type', 'text/xml');
+		xmlhttp.onerror = function(){
+			console.log('Error saving file to server! Presenting download locally');
+			createProjectSave(null);
+		};
+		xmlhttp.onreadystatechange  = function() {
+			console.log(xmlhttp.status);
+			if (xmlhttp.status != 200 && xmlhttp.readyState == 4) {
+				createProjectSave(null);
+			} else {
+				if (xmlhttp.responseXML == null)
+				{
+					createProjectSave('null');
+				}
+				var response = xmlhttp.responseXML.childNodes[0];
+				if (response.getAttribute('state') == "OK")
+				{
+					var file = response.getElementsByTagName('file')[0];
+					console.log('Save OK: Filename '+file.textContent+','+file.getAttribute('bytes')+'B');
+					popup.showPopup();
+					popup.popupContent.innerHTML = null;
+					popup.popupContent.textContent = "Thank you!";
+				} else {
+					var message = response.getElementsByTagName('message')[0];
+					errorSessionDump(message.textContent);
+				}
+			}
+		};
+		xmlhttp.send(file);
+		popup.showPopup();
+		popup.popupContent.innerHTML = null;
+		popup.popupContent.textContent = "Submitting. Please Wait";
+	}
+}
+
+function errorSessionDump(msg){
+	// Create the partial interface XML save
+	// Include error node with message on why the dump occured
+	popup.showPopup();
+	popup.popupContent.innerHTML = null;
+	var err = document.createElement('error');
+	var parent = document.createElement("div");
+	if (typeof msg === "object")
+	{
+		err.appendChild(msg);
+		popup.popupContent.appendChild(msg);
+		
+	} else {
+		err.textContent = msg;
+		popup.popupContent.innerHTML = "ERROR : "+msg;
+	}
+	var xmlDoc = interfaceXMLSave();
+	xmlDoc.appendChild(err);
+	parent.appendChild(xmlDoc);
+	var file = [parent.innerHTML];
+	var bb = new Blob(file,{type : 'application/xml'});
+	var dnlk = window.URL.createObjectURL(bb);
+	var a = document.createElement("a");
+	a.hidden = '';
+	a.href = dnlk;
+	a.download = "save.xml";
+	a.textContent = "Save File";
+	
+	
+	
+	popup.popupContent.appendChild(a);
+}
+
+// Only other global function which must be defined in the interface class. Determines how to create the XML document.
+function interfaceXMLSave(){
+	// Create the XML string to be exported with results
+	return storage.finish();
+}
+
+function linearToDecibel(gain)
+{
+	return 20.0*Math.log10(gain);
+}
+
+function decibelToLinear(gain)
+{
+	return Math.pow(10,gain/20.0);
+}
+
+function interfacePopup() {
+	// Creates an object to manage the popup
+	this.popup = null;
+	this.popupContent = null;
+	this.popupTitle = null;
+	this.popupResponse = null;
+	this.buttonProceed = null;
+	this.buttonPrevious = null;
+	this.popupOptions = null;
+	this.currentIndex = null;
+	this.node = null;
+	this.store = null;
+	$(window).keypress(function(e){
+			if (e.keyCode == 13 && popup.popup.style.visibility == 'visible')
+			{
+				console.log(e);
+				popup.buttonProceed.onclick();
+				e.preventDefault();
+			}
+		});
+	
+	this.createPopup = function(){
+		// Create popup window interface
+		var insertPoint = document.getElementById("topLevelBody");
+		
+		this.popup = document.getElementById('popupHolder');
+		this.popup.style.left = (window.innerWidth/2)-250 + 'px';
+		this.popup.style.top = (window.innerHeight/2)-125 + 'px';
+		
+		this.popupContent = document.getElementById('popupContent');
+		
+		this.popupTitle = document.getElementById('popupTitle');
+		
+		this.popupResponse = document.getElementById('popupResponse');
+		
+		this.buttonProceed = document.getElementById('popup-proceed');
+		this.buttonProceed.onclick = function(){popup.proceedClicked();};
+		
+		this.buttonPrevious = document.getElementById('popup-previous');
+		this.buttonPrevious.onclick = function(){popup.previousClick();};
+		
+        this.hidePopup();
+        
+		this.popup.style.zIndex = -1;
+		this.popup.style.visibility = 'hidden';
+	};
+	
+	this.showPopup = function(){
+		if (this.popup == null) {
+			this.createPopup();
+		}
+		this.popup.style.zIndex = 3;
+		this.popup.style.visibility = 'visible';
+		var blank = document.getElementsByClassName('testHalt')[0];
+		blank.style.zIndex = 2;
+		blank.style.visibility = 'visible';
+	};
+	
+	this.hidePopup = function(){
+		this.popup.style.zIndex = -1;
+		this.popup.style.visibility = 'hidden';
+		var blank = document.getElementsByClassName('testHalt')[0];
+		blank.style.zIndex = -2;
+		blank.style.visibility = 'hidden';
+		this.buttonPrevious.style.visibility = 'inherit';
+	};
+	
+	this.postNode = function() {
+		// This will take the node from the popupOptions and display it
+		var node = this.popupOptions[this.currentIndex];
+		this.popupResponse.innerHTML = null;
+		this.popupTitle.textContent = node.specification.statement;
+		if (node.specification.type == 'question') {
+			var textArea = document.createElement('textarea');
+			switch (node.specification.boxsize) {
+			case 'small':
+				textArea.cols = "20";
+				textArea.rows = "1";
+				break;
+			case 'normal':
+				textArea.cols = "30";
+				textArea.rows = "2";
+				break;
+			case 'large':
+				textArea.cols = "40";
+				textArea.rows = "5";
+				break;
+			case 'huge':
+				textArea.cols = "50";
+				textArea.rows = "10";
+				break;
+			}
+            if (node.response == undefined) {
+                node.response = "";
+            } else {
+                textArea.value = node.response;
+            }
+			this.popupResponse.appendChild(textArea);
+			textArea.focus();
+            this.popupResponse.style.textAlign="center";
+            this.popupResponse.style.left="0%";
+		} else if (node.specification.type == 'checkbox') {
+            if (node.response == undefined) {
+                node.response = Array(node.specification.options.length);
+            }
+            var index = 0;
+            var max_w = 0;
+			for (var option of node.specification.options) {
+				var input = document.createElement('input');
+				input.id = option.name;
+				input.type = 'checkbox';
+				var span = document.createElement('span');
+				span.textContent = option.text;
+				var hold = document.createElement('div');
+				hold.setAttribute('name','option');
+				hold.style.padding = '4px';
+				hold.appendChild(input);
+				hold.appendChild(span);
+				this.popupResponse.appendChild(hold);
+                if (node.response[index] != undefined){
+                    if (node.response[index].checked == true) {
+                        input.checked = "true";
+                    }
+                }
+                var w = $(span).width();
+                if (w > max_w)
+                    max_w = w;
+                index++;
+			}
+            max_w += 12;
+            this.popupResponse.style.textAlign="";
+            var leftP = ((max_w/500)/2)*100;
+            this.popupResponse.style.left=leftP+"%";
+		} else if (node.specification.type == 'radio') {
+            if (node.response == undefined) {
+                node.response = {name: "", text: ""};
+            }
+            var index = 0;
+            var max_w = 0;
+			for (var option of node.specification.options) {
+				var input = document.createElement('input');
+				input.id = option.name;
+				input.type = 'radio';
+				input.name = node.specification.id;
+				var span = document.createElement('span');
+				span.textContent = option.text;
+				var hold = document.createElement('div');
+				hold.setAttribute('name','option');
+				hold.style.padding = '4px';
+				hold.appendChild(input);
+				hold.appendChild(span);
+				this.popupResponse.appendChild(hold);
+                if (input.id == node.response.name) {
+                    input.checked = "true";
+                }
+                var w = $(span).width();
+                if (w > max_w)
+                    max_w = w;
+			}
+            max_w += 12;
+            this.popupResponse.style.textAlign="";
+            var leftP = ((max_w/500)/2)*100;
+            this.popupResponse.style.left=leftP+"%";
+		} else if (node.specification.type == 'number') {
+			var input = document.createElement('input');
+			input.type = 'textarea';
+			if (node.min != null) {input.min = node.specification.min;}
+			if (node.max != null) {input.max = node.specification.max;}
+			if (node.step != null) {input.step = node.specification.step;}
+            if (node.response != undefined) {
+                input.value = node.response;
+            }
+			this.popupResponse.appendChild(input);
+            this.popupResponse.style.textAlign="center";
+            this.popupResponse.style.left="0%";
+		}
+		if(this.currentIndex+1 == this.popupOptions.length) {
+			if (this.node.location == "pre") {
+				this.buttonProceed.textContent = 'Start';
+			} else {
+				this.buttonProceed.textContent = 'Submit';
+			}
+		} else {
+			this.buttonProceed.textContent = 'Next';
+		}
+		if(this.currentIndex > 0)
+			this.buttonPrevious.style.visibility = 'visible';
+		else
+			this.buttonPrevious.style.visibility = 'hidden';
+	};
+	
+	this.initState = function(node,store) {
+		//Call this with your preTest and postTest nodes when needed to
+		// initialise the popup procedure.
+		if (node.options.length > 0) {
+			this.popupOptions = [];
+			this.node = node;
+			this.store = store;
+			for (var opt of node.options)
+			{
+				this.popupOptions.push({
+					specification: opt,
+					response: null
+				});
+			}			
+			this.currentIndex = 0;
+			this.showPopup();
+			this.postNode();
+		} else {
+			advanceState();
+		}
+	};
+	
+	this.proceedClicked = function() {
+		// Each time the popup button is clicked!
+		var node = this.popupOptions[this.currentIndex];
+		if (node.specification.type == 'question') {
+			// Must extract the question data
+			var textArea = $(popup.popupContent).find('textarea')[0];
+			if (node.specification.mandatory == true && textArea.value.length == 0) {
+				alert('This question is mandatory');
+				return;
+			} else {
+				// Save the text content
+				console.log("Question: "+ node.specification.statement);
+				console.log("Question Response: "+ textArea.value);
+				node.response = textArea.value;
+			}
+		} else if (node.specification.type == 'checkbox') {
+			// Must extract checkbox data
+			console.log("Checkbox: "+ node.specification.statement);
+			var inputs = this.popupResponse.getElementsByTagName('input');
+			node.response = [];
+			for (var i=0; i<node.specification.options.length; i++) {
+				node.response.push({
+					name: node.specification.options[i].name,
+					text: node.specification.options[i].text,
+					checked: inputs[i].checked
+				});
+				console.log(node.specification.options[i].name+": "+ inputs[i].checked);
+			}
+		} else if (node.specification.type == "radio") {
+			var optHold = this.popupResponse;
+			console.log("Radio: "+ node.specification.statement);
+			node.response = null;
+			var i=0;
+			var inputs = optHold.getElementsByTagName('input');
+			while(node.response == null) {
+				if (i == inputs.length)
+				{
+					if (node.specification.mandatory == true)
+					{
+						alert("This radio is mandatory");
+					} else {
+						node.response = -1;
+					}
+					return;
+				}
+				if (inputs[i].checked == true) {
+					node.response = node.specification.options[i];
+					console.log("Selected: "+ node.specification.options[i].name);
+				}
+				i++;
+			}
+		} else if (node.specification.type == "number") {
+			var input = this.popupContent.getElementsByTagName('input')[0];
+			if (node.mandatory == true && input.value.length == 0) {
+				alert('This question is mandatory. Please enter a number');
+				return;
+			}
+			var enteredNumber = Number(input.value);
+			if (isNaN(enteredNumber)) {
+				alert('Please enter a valid number');
+				return;
+			}
+			if (enteredNumber < node.min && node.min != null) {
+				alert('Number is below the minimum value of '+node.min);
+				return;
+			}
+			if (enteredNumber > node.max && node.max != null) {
+				alert('Number is above the maximum value of '+node.max);
+				return;
+			}
+			node.response = input.value;
+		}
+		this.currentIndex++;
+		if (this.currentIndex < this.popupOptions.length) {
+			this.postNode();
+		} else {
+			// Reached the end of the popupOptions
+			this.hidePopup();
+			for (var node of this.popupOptions)
+			{
+				this.store.postResult(node);
+			}
+			advanceState();
+		}
+	};
+	
+	this.previousClick = function() {
+		// Triggered when the 'Back' button is clicked in the survey
+		if (this.currentIndex > 0) {
+			this.currentIndex--;
+			this.postNode();
+		}
+	};
+	
+	this.resize = function(event)
+	{
+		// Called on window resize;
+		if (this.popup != null) {
+			this.popup.style.left = (window.innerWidth/2)-250 + 'px';
+			this.popup.style.top = (window.innerHeight/2)-125 + 'px';
+			var blank = document.getElementsByClassName('testHalt')[0];
+			blank.style.width = window.innerWidth;
+			blank.style.height = window.innerHeight;
+		}
+	};
+}
+
+function advanceState()
+{
+	// Just for complete clarity
+	testState.advanceState();
+}
+
+function stateMachine()
+{
+	// Object prototype for tracking and managing the test state
+	this.stateMap = [];
+	this.preTestSurvey = null;
+	this.postTestSurvey = null;
+	this.stateIndex = null;
+	this.currentStateMap = null;
+	this.currentStatePosition = null;
+    this.currentStore = null;
+	this.initialise = function(){
+		
+		// Get the data from Specification
+		var pageHolder = [];
+		for (var page of specification.pages)
+		{
+            var repeat = page.repeatCount;
+            while(repeat >= 0)
+            {
+                pageHolder.push(page);
+                repeat--;
+            }
+		}
+		if (specification.randomiseOrder)
+		{
+			pageHolder = randomiseOrder(pageHolder);
+		}
+		for (var i=0; i<pageHolder.length; i++)
+		{
+			pageHolder[i].presentedId = i;
+		}
+		for (var i=0; i<specification.pages.length; i++)
+		{
+			if (specification.testPages < i && specification.testPages != 0) {break;}
+			this.stateMap.push(pageHolder[i]);
+			
+		}
+		if (specification.preTest != null) {this.preTestSurvey = specification.preTest;}
+		if (specification.postTest != null) {this.postTestSurvey = specification.postTest;}
+		
+		if (this.stateMap.length > 0) {
+			if(this.stateIndex != null) {
+				console.log('NOTE - State already initialise');
+			}
+			this.stateIndex = -1;
+		} else {
+			console.log('FATAL - StateMap not correctly constructed. EMPTY_STATE_MAP');
+		}
+	};
+	this.advanceState = function(){
+		if (this.stateIndex == null) {
+			this.initialise();
+		}
+		if (this.stateIndex == -1) {
+			this.stateIndex++;
+			console.log('Starting test...');
+			if (this.preTestSurvey != null)
+			{
+				popup.initState(this.preTestSurvey,storage.globalPreTest);
+			} else {
+				this.advanceState();
+			}
+		} else if (this.stateIndex == this.stateMap.length)
+		{
+			// All test pages complete, post test
+			console.log('Ending test ...');
+			this.stateIndex++;
+			if (this.postTestSurvey == null) {
+				this.advanceState();
+			} else {
+				popup.initState(this.postTestSurvey,storage.globalPostTest);
+			}
+		} else if (this.stateIndex > this.stateMap.length)
+		{
+			createProjectSave(specification.projectReturn);
+		}
+		else
+		{
+			if (this.currentStateMap == null)
+			{
+				this.currentStateMap = this.stateMap[this.stateIndex];
+				if (this.currentStateMap.randomiseOrder)
+				{
+					this.currentStateMap.audioElements = randomiseOrder(this.currentStateMap.audioElements);
+				}
+                this.currentStore = storage.createTestPageStore(this.currentStateMap);
+				if (this.currentStateMap.preTest != null)
+				{
+					this.currentStatePosition = 'pre';
+					popup.initState(this.currentStateMap.preTest,storage.testPages[this.stateIndex].preTest);
+				} else {
+					this.currentStatePosition = 'test';
+				}
+				interfaceContext.newPage(this.currentStateMap,storage.testPages[this.stateIndex]);
+				return;
+			}
+			switch(this.currentStatePosition)
+			{
+			case 'pre':
+				this.currentStatePosition = 'test';
+				break;
+			case 'test':
+				this.currentStatePosition = 'post';
+				// Save the data
+				this.testPageCompleted();
+				if (this.currentStateMap.postTest == null)
+				{
+					this.advanceState();
+					return;
+				} else {
+					popup.initState(this.currentStateMap.postTest,storage.testPages[this.stateIndex].postTest);
+				}
+				break;
+			case 'post':
+				this.stateIndex++;
+				this.currentStateMap = null;
+				this.advanceState();
+				break;
+			};
+		}
+	};
+	
+	this.testPageCompleted = function() {
+		// Function called each time a test page has been completed
+		var storePoint = storage.testPages[this.stateIndex];
+		// First get the test metric
+		
+		var metric = storePoint.XMLDOM.getElementsByTagName('metric')[0];
+		if (audioEngineContext.metric.enableTestTimer)
+		{
+			var testTime = storePoint.parent.document.createElement('metricresult');
+			testTime.id = 'testTime';
+			testTime.textContent = audioEngineContext.timer.testDuration;
+			metric.appendChild(testTime);
+		}
+		
+		var audioObjects = audioEngineContext.audioObjects;
+		for (var ao of audioEngineContext.audioObjects) 
+		{
+			ao.exportXMLDOM();
+		}
+		for (var element of interfaceContext.commentQuestions)
+		{
+			element.exportXMLDOM(storePoint);
+		}
+		pageXMLSave(storePoint.XMLDOM, this.currentStateMap);
+	};
+}
+
+function AudioEngine(specification) {
+	
+	// Create two output paths, the main outputGain and fooGain.
+	// Output gain is default to 1 and any items for playback route here
+	// Foo gain is used for analysis to ensure paths get processed, but are not heard
+	// because web audio will optimise and any route which does not go to the destination gets ignored.
+	this.outputGain = audioContext.createGain();
+	this.fooGain = audioContext.createGain();
+	this.fooGain.gain = 0;
+	
+	// Use this to detect playback state: 0 - stopped, 1 - playing
+	this.status = 0;
+	
+	// Connect both gains to output
+	this.outputGain.connect(audioContext.destination);
+	this.fooGain.connect(audioContext.destination);
+	
+	// Create the timer Object
+	this.timer = new timer();
+	// Create session metrics
+	this.metric = new sessionMetrics(this,specification);
+	
+	this.loopPlayback = false;
+	
+	this.pageStore = null;
+	
+	// Create store for new audioObjects
+	this.audioObjects = [];
+	
+	this.buffers = [];
+	this.bufferObj = function()
+	{
+		this.url = null;
+		this.buffer = null;
+		this.xmlRequest = new XMLHttpRequest();
+		this.xmlRequest.parent = this;
+		this.users = [];
+        this.progress = 0;
+        this.status = 0;
+		this.ready = function()
+		{
+            if (this.status >= 2)
+            {
+                this.status = 3;
+            }
+			for (var i=0; i<this.users.length; i++)
+			{
+				this.users[i].state = 1;
+				if (this.users[i].interfaceDOM != null)
+				{
+					this.users[i].bufferLoaded(this);
+				}
+			}
+		};
+		this.getMedia = function(url) {
+			this.url = url;
+			this.xmlRequest.open('GET',this.url,true);
+			this.xmlRequest.responseType = 'arraybuffer';
+			
+			var bufferObj = this;
+			
+			// Create callback to decode the data asynchronously
+			this.xmlRequest.onloadend = function() {
+                // Use inbuilt WAVE decoder first
+                var waveObj = new WAVE();
+                if (waveObj.open(bufferObj.xmlRequest.response) == 0)
+                {
+                    bufferObj.buffer = audioContext.createBuffer(waveObj.num_channels,waveObj.num_samples,waveObj.sample_rate);
+                    for (var c=0; c<waveObj.num_channels; c++)
+                    {
+                        var buffer_ptr = bufferObj.buffer.getChannelData(c);
+                        for (var n=0; n<waveObj.num_samples; n++)
+                        {
+                            buffer_ptr[n] = waveObj.decoded_data[c][n];
+                        }
+                    }
+                    
+                    delete waveObj;
+                } else {
+                    audioContext.decodeAudioData(bufferObj.xmlRequest.response, function(decodedData) {
+                        bufferObj.buffer = decodedData;
+                    }, function(e){
+                        // Should only be called if there was an error, but sometimes gets called continuously
+                        // Check here if the error is genuine
+                        if (bufferObj.xmlRequest.response == undefined) {
+                            // Genuine error
+                            console.log('FATAL - Error loading buffer on '+audioObj.id);
+                            if (request.status == 404)
+                            {
+                                console.log('FATAL - Fragment '+audioObj.id+' 404 error');
+                                console.log('URL: '+audioObj.url);
+                                errorSessionDump('Fragment '+audioObj.id+' 404 error');
+                            }
+                            this.status = -1;
+                        }
+                    });
+                }
+                if (bufferObj.buffer != undefined)
+                {
+                    bufferObj.status = 2;
+                    calculateLoudness(bufferObj,"I");
+                }
+			};
+			this.progress = 0;
+			this.progressCallback = function(event){
+				if (event.lengthComputable)
+				{
+					this.parent.progress = event.loaded / event.total;
+					for (var i=0; i<this.parent.users.length; i++)
+					{
+						if(this.parent.users[i].interfaceDOM != null)
+						{
+							if (typeof this.parent.users[i].interfaceDOM.updateLoading === "function")
+							{
+								this.parent.users[i].interfaceDOM.updateLoading(this.parent.progress*100);
+							}
+						}
+					}
+				}
+			};
+			this.xmlRequest.addEventListener("progress", this.progressCallback);
+            this.status = 1;
+			this.xmlRequest.send();
+		};
+        
+        this.registerAudioObject = function(audioObject)
+        {
+            // Called by an audioObject to register to the buffer for use
+            // First check if already in the register pool
+            for (var objects of this.users)
+            {
+                if (audioObject.id == objects.id){return 0;}
+            }
+            this.users.push(audioObject);
+            if (this.status == 3)
+            {
+                // The buffer is already ready, trigger bufferLoaded
+                audioObject.bufferLoaded(this);
+            }
+        }
+	};
+	
+	this.play = function(id) {
+		// Start the timer and set the audioEngine state to playing (1)
+		if (this.status == 0 && this.loopPlayback) {
+			// Check if all audioObjects are ready
+			if(this.checkAllReady())
+			{
+				this.status = 1;
+				this.setSynchronousLoop();
+			}
+		}
+		else
+		{
+			this.status = 1;
+		}
+		if (this.status== 1) {
+			this.timer.startTest();
+			if (id == undefined) {
+				id = -1;
+				console.log('FATAL - Passed id was undefined - AudioEngineContext.play(id)');
+				return;
+			} else {
+				interfaceContext.playhead.setTimePerPixel(this.audioObjects[id]);
+			}
+			if (this.loopPlayback) {
+                var setTime = audioContext.currentTime+2;
+				for (var i=0; i<this.audioObjects.length; i++)
+				{
+					this.audioObjects[i].play(setTime-2);
+					if (id == i) {
+						this.audioObjects[i].loopStart(setTime);
+					} else {
+						this.audioObjects[i].loopStop(setTime);
+					}
+				}
+			} else {
+                var setTime = audioContext.currentTime+0.1;
+				for (var i=0; i<this.audioObjects.length; i++)
+				{
+					if (i != id) {
+						this.audioObjects[i].stop(setTime);
+					} else if (i == id) {
+						this.audioObjects[id].play(setTime);
+					}
+				}
+			}
+			interfaceContext.playhead.start();
+		}
+	};
+	
+	this.stop = function() {
+		// Send stop and reset command to all playback buffers
+		if (this.status == 1) {
+            var setTime = audioContext.currentTime+0.1;
+			for (var i=0; i<this.audioObjects.length; i++)
+			{
+				this.audioObjects[i].stop(setTime);
+			}
+			interfaceContext.playhead.stop();
+		}
+	};
+	
+	this.newTrack = function(element) {
+		// Pull data from given URL into new audio buffer
+		// URLs must either be from the same source OR be setup to 'Access-Control-Allow-Origin'
+		
+		// Create the audioObject with ID of the new track length;
+		audioObjectId = this.audioObjects.length;
+		this.audioObjects[audioObjectId] = new audioObject(audioObjectId);
+
+		// Check if audioObject buffer is currently stored by full URL
+		var URL = testState.currentStateMap.hostURL + element.url;
+		var buffer = null;
+		for (var i=0; i<this.buffers.length; i++)
+		{
+			if (URL == this.buffers[i].url)
+			{
+				buffer = this.buffers[i];
+				break;
+			}
+		}
+		if (buffer == null)
+		{
+			console.log("[WARN]: Buffer was not loaded in pre-test! "+URL);
+			buffer = new this.bufferObj();
+            this.buffers.push(buffer);
+			buffer.getMedia(URL);
+		}
+		this.audioObjects[audioObjectId].specification = element;
+		this.audioObjects[audioObjectId].url = URL;
+		// Obtain store node
+		var aeNodes = this.pageStore.XMLDOM.getElementsByTagName('audioelement');
+		for (var i=0; i<aeNodes.length; i++)
+		{
+			if(aeNodes[i].id == element.id)
+			{
+				this.audioObjects[audioObjectId].storeDOM = aeNodes[i];
+				break;
+			}
+		}
+        buffer.registerAudioObject(this.audioObjects[audioObjectId]);
+		return this.audioObjects[audioObjectId];
+	};
+	
+	this.newTestPage = function(audioHolderObject,store) {
+		this.pageStore = store;
+		this.state = 0;
+		this.audioObjectsReady = false;
+		this.metric.reset();
+		for (var i=0; i < this.buffers.length; i++)
+		{
+			this.buffers[i].users = [];
+		}
+		this.audioObjects = [];
+        this.timer = new timer();
+        this.loopPlayback = audioHolderObject.loop;
+	};
+	
+	this.checkAllPlayed = function() {
+		arr = [];
+		for (var id=0; id<this.audioObjects.length; id++) {
+			if (this.audioObjects[id].metric.wasListenedTo == false) {
+				arr.push(this.audioObjects[id].id);
+			}
+		}
+		return arr;
+	};
+	
+	this.checkAllReady = function() {
+		var ready = true;
+		for (var i=0; i<this.audioObjects.length; i++) {
+			if (this.audioObjects[i].state == 0) {
+				// Track not ready
+				console.log('WAIT -- audioObject '+i+' not ready yet!');
+				ready = false;
+			};
+		}
+		return ready;
+	};
+	
+	this.setSynchronousLoop = function() {
+		// Pads the signals so they are all exactly the same length
+		var length = 0;
+		var maxId;
+		for (var i=0; i<this.audioObjects.length; i++)
+		{
+			if (length < this.audioObjects[i].buffer.buffer.length)
+			{
+				length = this.audioObjects[i].buffer.buffer.length;
+				maxId = i;
+			}
+		}
+		// Extract the audio and zero-pad
+		for (var i=0; i<this.audioObjects.length; i++)
+		{
+			var orig = this.audioObjects[i].buffer.buffer;
+			var hold = audioContext.createBuffer(orig.numberOfChannels,length,orig.sampleRate);
+			for (var c=0; c<orig.numberOfChannels; c++)
+			{
+				var inData = hold.getChannelData(c);
+				var outData = orig.getChannelData(c);
+				for (var n=0; n<orig.length; n++)
+				{inData[n] = outData[n];}
+			}
+			hold.playbackGain = orig.playbackGain;
+			hold.lufs = orig.lufs;
+			this.audioObjects[i].buffer.buffer = hold;
+		}
+	};
+    
+    this.exportXML = function()
+    {
+        
+    };
+	
+}
+
+function audioObject(id) {
+	// The main buffer object with common control nodes to the AudioEngine
+	
+	this.specification;
+	this.id = id;
+	this.state = 0; // 0 - no data, 1 - ready
+	this.url = null; // Hold the URL given for the output back to the results.
+	this.metric = new metricTracker(this);
+	this.storeDOM = null;
+	
+	// Bindings for GUI
+	this.interfaceDOM = null;
+	this.commentDOM = null;
+	
+	// Create a buffer and external gain control to allow internal patching of effects and volume leveling.
+	this.bufferNode = undefined;
+	this.outputGain = audioContext.createGain();
+	
+	this.onplayGain = 1.0;
+	
+	// Connect buffer to the audio graph
+	this.outputGain.connect(audioEngineContext.outputGain);
+	
+	// the audiobuffer is not designed for multi-start playback
+	// When stopeed, the buffer node is deleted and recreated with the stored buffer.
+	this.buffer;
+	
+	this.bufferLoaded = function(callee)
+	{
+		// Called by the associated buffer when it has finished loading, will then 'bind' the buffer to the
+		// audioObject and trigger the interfaceDOM.enable() function for user feedback
+		if (audioEngineContext.loopPlayback){
+			// First copy the buffer into this.buffer
+			this.buffer = new audioEngineContext.bufferObj();
+			this.buffer.url = callee.url;
+			this.buffer.buffer = audioContext.createBuffer(callee.buffer.numberOfChannels, callee.buffer.length, callee.buffer.sampleRate);
+			for (var c=0; c<callee.buffer.numberOfChannels; c++)
+			{
+				var src = callee.buffer.getChannelData(c);
+				var dst = this.buffer.buffer.getChannelData(c);
+				for (var n=0; n<src.length; n++)
+				{
+					dst[n] = src[n];
+				}
+			}
+		} else {
+			this.buffer = callee;
+		}
+		this.state = 1;
+		this.buffer.buffer.playbackGain = callee.buffer.playbackGain;
+		this.buffer.buffer.lufs = callee.buffer.lufs;
+		var targetLUFS = this.specification.parent.loudness || specification.loudness;
+		if (typeof targetLUFS === "number")
+		{
+			this.buffer.buffer.playbackGain = decibelToLinear(targetLUFS - this.buffer.buffer.lufs);
+		} else {
+			this.buffer.buffer.playbackGain = 1.0;
+		}
+		if (this.interfaceDOM != null) {
+			this.interfaceDOM.enable();
+		}
+		this.onplayGain = decibelToLinear(this.specification.gain)*this.buffer.buffer.playbackGain;
+		this.storeDOM.setAttribute('playGain',linearToDecibel(this.onplayGain));
+	};
+	
+	this.bindInterface = function(interfaceObject)
+	{
+		this.interfaceDOM = interfaceObject;
+		this.metric.initialise(interfaceObject.getValue());
+		if (this.state == 1)
+		{
+			this.interfaceDOM.enable();
+		}
+		this.storeDOM.setAttribute('presentedId',interfaceObject.getPresentedId());
+	};
+    
+	this.loopStart = function(setTime) {
+		this.outputGain.gain.linearRampToValueAtTime(this.onplayGain,setTime);
+		this.metric.startListening(audioEngineContext.timer.getTestTime());
+        this.interfaceDOM.startPlayback();
+	};
+	
+	this.loopStop = function(setTime) {
+		if (this.outputGain.gain.value != 0.0) {
+			this.outputGain.gain.linearRampToValueAtTime(0.0,setTime);
+			this.metric.stopListening(audioEngineContext.timer.getTestTime());
+		}
+        this.interfaceDOM.stopPlayback();
+	};
+	
+	this.play = function(startTime) {
+		if (this.bufferNode == undefined && this.buffer.buffer != undefined) {
+			this.bufferNode = audioContext.createBufferSource();
+			this.bufferNode.owner = this;
+			this.bufferNode.connect(this.outputGain);
+			this.bufferNode.buffer = this.buffer.buffer;
+			this.bufferNode.loop = audioEngineContext.loopPlayback;
+			this.bufferNode.onended = function(event) {
+				// Safari does not like using 'this' to reference the calling object!
+				//event.currentTarget.owner.metric.stopListening(audioEngineContext.timer.getTestTime(),event.currentTarget.owner.getCurrentPosition());
+				event.currentTarget.owner.stop(audioContext.currentTime+1);
+			};
+			if (this.bufferNode.loop == false) {
+				this.metric.startListening(audioEngineContext.timer.getTestTime());
+                this.outputGain.gain.setValueAtTime(this.onplayGain,startTime);
+                this.interfaceDOM.startPlayback();
+			} else {
+                 this.outputGain.gain.setValueAtTime(0.0,startTime);
+            }
+			this.bufferNode.start(startTime);
+		}
+	};
+	
+	this.stop = function(stopTime) {
+        this.outputGain.gain.cancelScheduledValues(audioContext.currentTime);
+		if (this.bufferNode != undefined)
+		{
+			this.metric.stopListening(audioEngineContext.timer.getTestTime(),this.getCurrentPosition());
+			this.bufferNode.stop(stopTime);
+			this.bufferNode = undefined;
+		}
+        this.outputGain.gain.value = 0.0;
+        this.interfaceDOM.stopPlayback();
+	};
+	
+	this.getCurrentPosition = function() {
+		var time = audioEngineContext.timer.getTestTime();
+		if (this.bufferNode != undefined) {
+			if (this.bufferNode.loop == true) {
+				if (audioEngineContext.status  == 1) {
+					return (time-this.metric.listenStart)%this.buffer.buffer.duration;
+				} else {
+					return 0;
+				}
+			} else {
+				if (this.metric.listenHold) {
+					return time - this.metric.listenStart;
+				} else {
+					return 0;
+				}
+			}
+		} else {
+			return 0;
+		}
+	};
+	
+	this.exportXMLDOM = function() {
+		var file = storage.document.createElement('file');
+		file.setAttribute('sampleRate',this.buffer.buffer.sampleRate);
+		file.setAttribute('channels',this.buffer.buffer.numberOfChannels);
+		file.setAttribute('sampleCount',this.buffer.buffer.length);
+		file.setAttribute('duration',this.buffer.buffer.duration);
+		this.storeDOM.appendChild(file);
+		if (this.specification.type != 'outside-reference') {
+			var interfaceXML = this.interfaceDOM.exportXMLDOM(this);
+			if (interfaceXML != null)
+			{
+				if (interfaceXML.length == undefined) {
+					this.storeDOM.appendChild(interfaceXML);
+				} else {
+					for (var i=0; i<interfaceXML.length; i++)
+					{
+						this.storeDOM.appendChild(interfaceXML[i]);
+					}
+				}
+			}
+			if (this.commentDOM != null) {
+				this.storeDOM.appendChild(this.commentDOM.exportXMLDOM(this));
+			}
+		}
+		var nodes = this.metric.exportXMLDOM();
+		var mroot = this.storeDOM.getElementsByTagName('metric')[0];
+		for (var i=0; i<nodes.length; i++)
+		{
+			mroot.appendChild(nodes[i]);
+		}
+	};
+}
+
+function timer()
+{
+	/* Timer object used in audioEngine to keep track of session timings
+	 * Uses the timer of the web audio API, so sample resolution
+	 */
+	this.testStarted = false;
+	this.testStartTime = 0;
+	this.testDuration = 0;
+	this.minimumTestTime = 0; // No minimum test time
+	this.startTest = function()
+	{
+		if (this.testStarted == false)
+		{
+			this.testStartTime = audioContext.currentTime;
+			this.testStarted = true;
+			this.updateTestTime();
+			audioEngineContext.metric.initialiseTest();
+		}
+	};
+	this.stopTest = function()
+	{
+		if (this.testStarted)
+		{
+			this.testDuration = this.getTestTime();
+			this.testStarted = false;
+		} else {
+			console.log('ERR: Test tried to end before beginning');
+		}
+	};
+	this.updateTestTime = function()
+	{
+		if (this.testStarted)
+		{
+			this.testDuration = audioContext.currentTime - this.testStartTime;
+		}
+	};
+	this.getTestTime = function()
+	{
+		this.updateTestTime();
+		return this.testDuration;
+	};
+}
+
+function sessionMetrics(engine,specification)
+{
+	/* Used by audioEngine to link to audioObjects to minimise the timer call timers;
+	 */
+	this.engine = engine;
+	this.lastClicked = -1;
+	this.data = -1;
+	this.reset = function() {
+		this.lastClicked = -1;
+		this.data = -1;
+	};
+	
+	this.enableElementInitialPosition = false;
+	this.enableElementListenTracker = false;
+	this.enableElementTimer = false;
+	this.enableElementTracker = false;
+	this.enableFlagListenedTo = false;
+	this.enableFlagMoved = false;
+	this.enableTestTimer = false;
+	// Obtain the metrics enabled
+	for (var i=0; i<specification.metrics.enabled.length; i++)
+	{
+		var node = specification.metrics.enabled[i];
+		switch(node)
+		{
+		case 'testTimer':
+			this.enableTestTimer = true;
+			break;
+		case 'elementTimer':
+			this.enableElementTimer = true;
+			break;
+		case 'elementTracker':
+			this.enableElementTracker = true;
+			break;
+		case 'elementListenTracker':
+			this.enableElementListenTracker = true;
+			break;
+		case 'elementInitialPosition':
+			this.enableElementInitialPosition = true;
+			break;
+		case 'elementFlagListenedTo':
+			this.enableFlagListenedTo = true;
+			break;
+		case 'elementFlagMoved':
+			this.enableFlagMoved = true;
+			break;
+		case 'elementFlagComments':
+			this.enableFlagComments = true;
+			break;
+		}
+	}
+	this.initialiseTest = function(){};
+}
+
+function metricTracker(caller)
+{
+	/* Custom object to track and collect metric data
+	 * Used only inside the audioObjects object.
+	 */
+	
+	this.listenedTimer = 0;
+	this.listenStart = 0;
+	this.listenHold = false;
+	this.initialPosition = -1;
+	this.movementTracker = [];
+	this.listenTracker =[];
+	this.wasListenedTo = false;
+	this.wasMoved = false;
+	this.hasComments = false;
+	this.parent = caller;
+	
+	this.initialise = function(position)
+	{
+		if (this.initialPosition == -1) {
+			this.initialPosition = position;
+			this.moved(0,position);
+		}
+	};
+	
+	this.moved = function(time,position)
+	{
+		if (time > 0) {this.wasMoved = true;}
+		this.movementTracker[this.movementTracker.length] = [time, position];
+	};
+	
+	this.startListening = function(time)
+	{
+		if (this.listenHold == false)
+		{
+			this.wasListenedTo = true;
+			this.listenStart = time;
+			this.listenHold = true;
+			
+			var evnt = document.createElement('event');
+			var testTime = document.createElement('testTime');
+			testTime.setAttribute('start',time);
+			var bufferTime = document.createElement('bufferTime');
+			bufferTime.setAttribute('start',this.parent.getCurrentPosition());
+			evnt.appendChild(testTime);
+			evnt.appendChild(bufferTime);
+			this.listenTracker.push(evnt);
+			
+			console.log('slider ' + this.parent.id + ' played (' + time + ')'); // DEBUG/SAFETY: show played slider id
+		}
+	};
+	
+	this.stopListening = function(time,bufferStopTime)
+	{
+		if (this.listenHold == true)
+		{
+			var diff = time - this.listenStart;
+			this.listenedTimer += (diff);
+			this.listenStart = 0;
+			this.listenHold = false;
+			
+			var evnt = this.listenTracker[this.listenTracker.length-1];
+			var testTime = evnt.getElementsByTagName('testTime')[0];
+			var bufferTime = evnt.getElementsByTagName('bufferTime')[0];
+			testTime.setAttribute('stop',time);
+			if (bufferStopTime == undefined) {
+				bufferTime.setAttribute('stop',this.parent.getCurrentPosition());
+			} else {
+				bufferTime.setAttribute('stop',bufferStopTime);
+			}
+			console.log('slider ' + this.parent.id + ' played for (' + diff + ')'); // DEBUG/SAFETY: show played slider id
+		}
+	};
+	
+	this.exportXMLDOM = function() {
+		var storeDOM = [];
+		if (audioEngineContext.metric.enableElementTimer) {
+			var mElementTimer = storage.document.createElement('metricresult');
+			mElementTimer.setAttribute('name','enableElementTimer');
+			mElementTimer.textContent = this.listenedTimer;
+			storeDOM.push(mElementTimer);
+		}
+		if (audioEngineContext.metric.enableElementTracker) {
+			var elementTrackerFull = storage.document.createElement('metricResult');
+			elementTrackerFull.setAttribute('name','elementTrackerFull');
+			for (var k=0; k<this.movementTracker.length; k++)
+			{
+				var timePos = storage.document.createElement('timePos');
+				timePos.id = k;
+				var time = storage.document.createElement('time');
+				time.textContent = this.movementTracker[k][0];
+				var position = document.createElement('position');
+				position.textContent = this.movementTracker[k][1];
+				timePos.appendChild(time);
+				timePos.appendChild(position);
+				elementTrackerFull.appendChild(timePos);
+			}
+			storeDOM.push(elementTrackerFull);
+		}
+		if (audioEngineContext.metric.enableElementListenTracker) {
+			var elementListenTracker = storage.document.createElement('metricResult');
+			elementListenTracker.setAttribute('name','elementListenTracker');
+			for (var k=0; k<this.listenTracker.length; k++) {
+				elementListenTracker.appendChild(this.listenTracker[k]);
+			}
+			storeDOM.push(elementListenTracker);
+		}
+		if (audioEngineContext.metric.enableElementInitialPosition) {
+			var elementInitial = storage.document.createElement('metricResult');
+			elementInitial.setAttribute('name','elementInitialPosition');
+			elementInitial.textContent = this.initialPosition;
+			storeDOM.push(elementInitial);
+		}
+		if (audioEngineContext.metric.enableFlagListenedTo) {
+			var flagListenedTo = storage.document.createElement('metricResult');
+			flagListenedTo.setAttribute('name','elementFlagListenedTo');
+			flagListenedTo.textContent = this.wasListenedTo;
+			storeDOM.push(flagListenedTo);
+		}
+		if (audioEngineContext.metric.enableFlagMoved) {
+			var flagMoved = storage.document.createElement('metricResult');
+			flagMoved.setAttribute('name','elementFlagMoved');
+			flagMoved.textContent = this.wasMoved;
+			storeDOM.push(flagMoved);
+		}
+		if (audioEngineContext.metric.enableFlagComments) {
+			var flagComments = storage.document.createElement('metricResult');
+			flagComments.setAttribute('name','elementFlagComments');
+			if (this.parent.commentDOM == null)
+				{flag.textContent = 'false';}
+			else if (this.parent.commentDOM.textContent.length == 0) 
+				{flag.textContent = 'false';}
+			else 
+				{flag.textContet = 'true';}
+			storeDOM.push(flagComments);
+		}
+		return storeDOM;
+	};
+}
+
+function randomiseOrder(input)
+{
+	// This takes an array of information and randomises the order
+	var N = input.length;
+	
+	var inputSequence = []; // For safety purposes: keep track of randomisation
+	for (var counter = 0; counter < N; ++counter) 
+		inputSequence.push(counter) // Fill array
+	var inputSequenceClone = inputSequence.slice(0);
+	
+	var holdArr = [];
+	var outputSequence = [];
+	for (var n=0; n<N; n++)
+	{
+		// First pick a random number
+		var r = Math.random();
+		// Multiply and floor by the number of elements left
+		r = Math.floor(r*input.length);
+		// Pick out that element and delete from the array
+		holdArr.push(input.splice(r,1)[0]);
+		// Do the same with sequence
+		outputSequence.push(inputSequence.splice(r,1)[0]);
+	}
+	console.log(inputSequenceClone.toString()); // print original array to console
+	console.log(outputSequence.toString()); 	// print randomised array to console
+	return holdArr;
+}
+
+function returnDateNode()
+{
+	// Create an XML Node for the Date and Time a test was conducted
+	// Structure is
+	// <datetime> 
+	//	<date year="##" month="##" day="##">DD/MM/YY</date>
+	//	<time hour="##" minute="##" sec="##">HH:MM:SS</time>
+	// </datetime>
+	var dateTime = new Date();
+	var year = document.createAttribute('year');
+	var month = document.createAttribute('month');
+	var day = document.createAttribute('day');
+	var hour = document.createAttribute('hour');
+	var minute = document.createAttribute('minute');
+	var secs = document.createAttribute('secs');
+	
+	year.nodeValue = dateTime.getFullYear();
+	month.nodeValue = dateTime.getMonth()+1;
+	day.nodeValue = dateTime.getDate();
+	hour.nodeValue = dateTime.getHours();
+	minute.nodeValue = dateTime.getMinutes();
+	secs.nodeValue = dateTime.getSeconds();
+	
+	var hold = document.createElement("datetime");
+	var date = document.createElement("date");
+	date.textContent = year.nodeValue+'/'+month.nodeValue+'/'+day.nodeValue;
+	var time = document.createElement("time");
+	time.textContent = hour.nodeValue+':'+minute.nodeValue+':'+secs.nodeValue;
+	
+	date.setAttributeNode(year);
+	date.setAttributeNode(month);
+	date.setAttributeNode(day);
+	time.setAttributeNode(hour);
+	time.setAttributeNode(minute);
+	time.setAttributeNode(secs);
+	
+	hold.appendChild(date);
+	hold.appendChild(time);
+	return hold;
+	
+}
+
+function Specification() {
+	// Handles the decoding of the project specification XML into a simple JavaScript Object.
+	
+	this.interface = null;
+	this.projectReturn = "null";
+	this.randomiseOrder = null;
+	this.testPages = null;
+	this.pages = [];
+	this.metrics = null;
+	this.interfaces = null;
+	this.loudness = null;
+	this.errors = [];
+	this.schema = null;
+	
+	this.processAttribute = function(attribute,schema)
+	{
+		// attribute is the string returned from getAttribute on the XML
+		// schema is the <xs:attribute> node
+		if (schema.getAttribute('name') == undefined && schema.getAttribute('ref') != undefined)
+		{
+			schema = this.schema.getAllElementsByName(schema.getAttribute('ref'))[0];
+		}
+		var defaultOpt = schema.getAttribute('default');
+		if (attribute == null) {
+			attribute = defaultOpt;
+		}
+		var dataType = schema.getAttribute('type');
+		if (typeof dataType == "string") { dataType = dataType.substr(3);}
+		else {dataType = "string";}
+		if (attribute == null)
+		{
+			return attribute;
+		}
+		switch(dataType)
+		{
+		case "boolean":
+			if (attribute == 'true'){attribute = true;}else{attribute=false;}
+			break;
+		case "negativeInteger":
+		case "positiveInteger":
+		case "nonNegativeInteger":
+		case "nonPositiveInteger":
+		case "integer":
+		case "decimal":
+		case "short":
+			attribute = Number(attribute);
+			break;
+		case "string":
+		default:
+			attribute = String(attribute);
+			break;
+		}
+		return attribute;
+	};
+	
+	this.decode = function(projectXML) {
+		this.errors = [];
+		// projectXML - DOM Parsed document
+		this.projectXML = projectXML.childNodes[0];
+		var setupNode = projectXML.getElementsByTagName('setup')[0];
+		var schemaSetup = this.schema.getAllElementsByName('setup')[0];
+		// First decode the attributes
+		var attributes = schemaSetup.getAllElementsByTagName('xs:attribute');
+		for (var i in attributes)
+		{
+			if (isNaN(Number(i)) == true){break;}
+			var attributeName = attributes[i].getAttribute('name');
+			var projectAttr = setupNode.getAttribute(attributeName);
+			projectAttr = this.processAttribute(projectAttr,attributes[i]);
+			switch(typeof projectAttr)
+			{
+			case "number":
+			case "boolean":
+				eval('this.'+attributeName+' = '+projectAttr);
+				break;
+			case "string":
+				eval('this.'+attributeName+' = "'+projectAttr+'"');
+				break;
+			}
+			
+		}
+		
+		this.metrics = new this.metricNode();
+		
+		this.metrics.decode(this,setupNode.getElementsByTagName('metric')[0]);
+		
+		// Now process the survey node options
+		var survey = setupNode.getElementsByTagName('survey');
+		for (var i in survey) {
+			if (isNaN(Number(i)) == true){break;}
+			var location = survey[i].getAttribute('location');
+			if (location == 'pre' || location == 'before')
+			{
+				if (this.preTest != null){this.errors.push("Already a pre/before test survey defined! Ignoring second!!");}
+				else {
+					this.preTest = new this.surveyNode();
+					this.preTest.decode(this,survey[i]);
+				}
+			} else if (location == 'post' || location == 'after') {
+				if (this.postTest != null){this.errors.push("Already a post/after test survey defined! Ignoring second!!");}
+				else {
+					this.postTest = new this.surveyNode();
+					this.postTest.decode(this,survey[i]);
+				}
+			}
+		}
+		
+		var interfaceNode = setupNode.getElementsByTagName('interface');
+		if (interfaceNode.length > 1)
+		{
+			this.errors.push("Only one <interface> node in the <setup> node allowed! Others except first ingnored!");
+		}
+		this.interfaces = new this.interfaceNode();
+		if (interfaceNode.length != 0)
+		{
+			interfaceNode = interfaceNode[0];
+			this.interfaces.decode(this,interfaceNode,this.schema.getAllElementsByName('interface')[1]);
+		}
+		
+		// Page tags
+		var pageTags = projectXML.getElementsByTagName('page');
+		var pageSchema = this.schema.getAllElementsByName('page')[0];
+		for (var i=0; i<pageTags.length; i++)
+		{
+			var node = new this.page();
+			node.decode(this,pageTags[i],pageSchema);
+			this.pages.push(node);
+		}
+	};
+	
+	this.encode = function()
+	{
+		var RootDocument = document.implementation.createDocument(null,"waet");
+		var root = RootDocument.children[0];
+        root.setAttribute("xmlns:xsi","http://www.w3.org/2001/XMLSchema-instance");
+        root.setAttribute("xsi:noNamespaceSchemaLocation","test-schema.xsd");
+		// Build setup node
+        var setup = RootDocument.createElement("setup");
+        var schemaSetup = this.schema.getAllElementsByName('setup')[0];
+        // First decode the attributes
+        var attributes = schemaSetup.getAllElementsByTagName('xs:attribute');
+        for (var i=0; i<attributes.length; i++)
+        {
+            var name = attributes[i].getAttribute("name");
+            if (name == undefined) {
+                name = attributes[i].getAttribute("ref");
+            }
+            if(eval("this."+name+" != undefined") || attributes[i].getAttribute("use") == "required")
+            {
+                eval("setup.setAttribute('"+name+"',this."+name+")");
+            }
+        }
+        root.appendChild(setup);
+        // Survey node
+        setup.appendChild(this.preTest.encode(RootDocument));
+        setup.appendChild(this.postTest.encode(RootDocument));
+        setup.appendChild(this.metrics.encode(RootDocument));
+        setup.appendChild(this.interfaces.encode(RootDocument));
+        for (var page of this.pages)
+        {
+            root.appendChild(page.encode(RootDocument));
+        }
+		return RootDocument;
+	};
+	
+	this.surveyNode = function() {
+		this.location = null;
+		this.options = [];
+		this.schema = specification.schema.getAllElementsByName('survey')[0];
+		
+		this.OptionNode = function() {
+			this.type = undefined;
+			this.schema = specification.schema.getAllElementsByName('surveyentry')[0];
+			this.id = undefined;
+			this.mandatory = undefined;
+			this.statement = undefined;
+			this.boxsize = undefined;
+			this.options = [];
+			this.min = undefined;
+			this.max = undefined;
+			this.step = undefined;
+			
+			this.decode = function(parent,child)
+			{
+				var attributeMap = this.schema.getAllElementsByTagName('xs:attribute');
+				for (var i in attributeMap){
+					if(isNaN(Number(i)) == true){break;}
+					var attributeName = attributeMap[i].getAttribute('name') || attributeMap[i].getAttribute('ref');
+					var projectAttr = child.getAttribute(attributeName);
+					projectAttr = parent.processAttribute(projectAttr,attributeMap[i]);
+					switch(typeof projectAttr)
+					{
+					case "number":
+					case "boolean":
+						eval('this.'+attributeName+' = '+projectAttr);
+						break;
+					case "string":
+						eval('this.'+attributeName+' = "'+projectAttr+'"');
+						break;
+					}
+				}
+				this.statement = child.getElementsByTagName('statement')[0].textContent;
+				if (this.type == "checkbox" || this.type == "radio") {
+					var children = child.getElementsByTagName('option');
+					if (children.length == null) {
+						console.log('Malformed' +child.nodeName+ 'entry');
+						this.statement = 'Malformed' +child.nodeName+ 'entry';
+						this.type = 'statement';
+					} else {
+						this.options = [];
+						for (var i in children)
+						{
+							if (isNaN(Number(i))==true){break;}
+							this.options.push({
+								name: children[i].getAttribute('name'),
+								text: children[i].textContent
+							});
+						}
+					}
+				}
+			};
+			
+			this.exportXML = function(doc)
+			{
+				var node = doc.createElement('surveyelement');
+				node.setAttribute('type',this.type);
+				var statement = doc.createElement('statement');
+				statement.textContent = this.statement;
+				node.appendChild(statement);
+				switch(this.type)
+				{
+				case "statement":
+					break;
+				case "question":
+					node.id = this.id;
+					node.setAttribute("mandatory",this.mandatory);
+					node.setAttribute("boxsize",this.boxsize);
+					break;
+				case "number":
+					node.id = this.id;
+					node.setAttribute("mandatory",this.mandatory);
+					node.setAttribute("min", this.min);
+					node.setAttribute("max", this.max);
+					node.setAttribute("step", this.step);
+					break;
+				case "checkbox":
+				case "radio":
+					node.id = this.id;
+					for (var i=0; i<this.options.length; i++)
+					{
+						var option = this.options[i];
+						var optionNode = doc.createElement("option");
+						optionNode.setAttribute("name",option.name);
+						optionNode.textContent = option.text;
+						node.appendChild(optionNode);
+					}
+					break;
+				}
+				return node;
+			};
+		};
+		this.decode = function(parent,xml) {
+			this.location = xml.getAttribute('location');
+			if (this.location == 'before'){this.location = 'pre';}
+			else if (this.location == 'after'){this.location = 'post';}
+			for (var i in xml.children)
+			{
+				if(isNaN(Number(i))==true){break;}
+				var node = new this.OptionNode();
+				node.decode(parent,xml.children[i]);
+				this.options.push(node);
+			}
+		};
+		this.encode = function(doc) {
+			var node = doc.createElement('survey');
+			node.setAttribute('location',this.location);
+			for (var i=0; i<this.options.length; i++)
+			{
+				node.appendChild(this.options[i].exportXML(doc));
+			}
+			return node;
+		};
+	};
+	
+	this.interfaceNode = function()
+	{
+		this.title = null;
+		this.name = null;
+		this.options = [];
+		this.scales = [];
+		this.schema = specification.schema.getAllElementsByName('interface')[1];
+		
+		this.decode = function(parent,xml) {
+			this.name = xml.getAttribute('name');
+			var titleNode = xml.getElementsByTagName('title');
+			if (titleNode.length == 1)
+			{
+				this.title = titleNode[0].textContent;
+			}
+			var interfaceOptionNodes = xml.getElementsByTagName('interfaceoption');
+			// Extract interfaceoption node schema
+			var interfaceOptionNodeSchema = this.schema.getAllElementsByName('interfaceoption')[0];
+			var attributeMap = interfaceOptionNodeSchema.getAllElementsByTagName('xs:attribute');
+			for (var i=0; i<interfaceOptionNodes.length; i++)
+			{
+				var ioNode = interfaceOptionNodes[i];
+				var option = {};
+				for (var j=0; j<attributeMap.length; j++)
+				{
+					var attributeName = attributeMap[j].getAttribute('name') || attributeMap[j].getAttribute('ref');
+					var projectAttr = ioNode.getAttribute(attributeName);
+					projectAttr = parent.processAttribute(projectAttr,attributeMap[j]);
+					switch(typeof projectAttr)
+					{
+					case "number":
+					case "boolean":
+						eval('option.'+attributeName+' = '+projectAttr);
+						break;
+					case "string":
+						eval('option.'+attributeName+' = "'+projectAttr+'"');
+						break;
+					}
+				}
+				this.options.push(option);
+			}
+			
+			// Now the scales nodes
+			var scaleParent = xml.getElementsByTagName('scales');
+			if (scaleParent.length == 1) {
+				scaleParent = scaleParent[0];
+				for (var i=0; i<scaleParent.children.length; i++) {
+					var child = scaleParent.children[i];
+					this.scales.push({
+						text: child.textContent,
+						position: Number(child.getAttribute('position'))
+					});
+				}
+			}
+		};
+		
+		this.encode = function(doc) {
+			var node = doc.createElement("interface");
+            if (typeof name == "string")
+                node.setAttribute("name",this.name);
+            for (var option of this.options)
+            {
+                var child = doc.createElement("interfaceoption");
+                child.setAttribute("type",option.type);
+                child.setAttribute("name",option.name);
+                node.appendChild(child);
+            }
+            if (this.scales.length != 0) {
+                var scales = doc.createElement("scales");
+                for (var scale of this.scales)
+                {
+                    var child = doc.createElement("scalelabel");
+                    child.setAttribute("position",scale.position);
+                    child.textContent = scale.text;
+                    scales.appendChild(child);
+                }
+                node.appendChild(scales);
+            }
+            return node;
+		};
+	};
+	
+    this.metricNode = function() {
+        this.enabled = [];
+        this.decode = function(parent, xml) {
+            var children = xml.getElementsByTagName('metricenable');
+            for (var i in children) { 
+                if (isNaN(Number(i)) == true){break;}
+                this.enabled.push(children[i].textContent);
+            }
+        }
+        this.encode = function(doc) {
+            var node = doc.createElement('metric');
+            for (var i in this.enabled)
+            {
+                if (isNaN(Number(i)) == true){break;}
+                var child = doc.createElement('metricenable');
+                child.textContent = this.enabled[i];
+                node.appendChild(child);
+            }
+            return node;
+        }
+    }
+    
+	this.page = function() {
+		this.presentedId = undefined;
+		this.id = undefined;
+		this.hostURL = undefined;
+		this.randomiseOrder = undefined;
+		this.loop = undefined;
+		this.showElementComments = undefined;
+		this.outsideReference = null;
+		this.loudness = null;
+		this.preTest = null;
+		this.postTest = null;
+		this.interfaces = [];
+		this.commentBoxPrefix = "Comment on track";
+		this.audioElements = [];
+		this.commentQuestions = [];
+		this.schema = specification.schema.getAllElementsByName("page")[0];
+		
+		this.decode = function(parent,xml)
+		{
+			var attributeMap = this.schema.getAllElementsByTagName('xs:attribute');
+			for (var i=0; i<attributeMap.length; i++)
+			{
+				var attributeName = attributeMap[i].getAttribute('name') || attributeMap[i].getAttribute('ref');
+				var projectAttr = xml.getAttribute(attributeName);
+				projectAttr = parent.processAttribute(projectAttr,attributeMap[i]);
+				switch(typeof projectAttr)
+				{
+				case "number":
+				case "boolean":
+					eval('this.'+attributeName+' = '+projectAttr);
+					break;
+				case "string":
+					eval('this.'+attributeName+' = "'+projectAttr+'"');
+					break;
+				}
+			}
+			
+			// Get the Comment Box Prefix
+			var CBP = xml.getElementsByTagName('commentboxprefix');
+			if (CBP.length != 0) {
+				this.commentBoxPrefix = CBP[0].textContent;
+			}
+			
+			// Now decode the interfaces
+			var interfaceNode = xml.getElementsByTagName('interface');
+			for (var i=0; i<interfaceNode.length; i++)
+			{
+				var node = new parent.interfaceNode();
+				node.decode(this,interfaceNode[i],parent.schema.getAllElementsByName('interface')[1]);
+				this.interfaces.push(node);
+			}
+			
+			// Now process the survey node options
+			var survey = xml.getElementsByTagName('survey');
+			var surveySchema = parent.schema.getAllElementsByName('survey')[0];
+			for (var i in survey) {
+				if (isNaN(Number(i)) == true){break;}
+				var location = survey[i].getAttribute('location');
+				if (location == 'pre' || location == 'before')
+				{
+					if (this.preTest != null){this.errors.push("Already a pre/before test survey defined! Ignoring second!!");}
+					else {
+						this.preTest = new parent.surveyNode();
+						this.preTest.decode(parent,survey[i],surveySchema);
+					}
+				} else if (location == 'post' || location == 'after') {
+					if (this.postTest != null){this.errors.push("Already a post/after test survey defined! Ignoring second!!");}
+					else {
+						this.postTest = new parent.surveyNode();
+						this.postTest.decode(parent,survey[i],surveySchema);
+					}
+				}
+			}
+			
+			// Now process the audioelement tags
+			var audioElements = xml.getElementsByTagName('audioelement');
+			for (var i=0; i<audioElements.length; i++)
+			{
+				var node = new this.audioElementNode();
+				node.decode(this,audioElements[i]);
+				this.audioElements.push(node);
+			}
+			
+			// Now decode the commentquestions
+			var commentQuestions = xml.getElementsByTagName('commentquestion');
+			for (var i=0; i<commentQuestions.length; i++)
+			{
+				var node = new this.commentQuestionNode();
+				node.decode(parent,commentQuestions[i]);
+				this.commentQuestions.push(node);
+			}
+		};
+		
+		this.encode = function(root)
+		{
+			var AHNode = root.createElement("page");
+            // First decode the attributes
+            var attributes = this.schema.getAllElementsByTagName('xs:attribute');
+            for (var i=0; i<attributes.length; i++)
+            {
+                var name = attributes[i].getAttribute("name");
+                if (name == undefined) {
+                    name = attributes[i].getAttribute("ref");
+                }
+                if(eval("this."+name+" != undefined") || attributes[i].getAttribute("use") == "required")
+                {
+                    eval("AHNode.setAttribute('"+name+"',this."+name+")");
+                }
+            }
+			if(this.loudness != null) {AHNode.setAttribute("loudness",this.loudness);}
+            // <commentboxprefix>
+            var commentboxprefix = root.createElement("commentboxprefix");
+            commentboxprefix.textContent = this.commentBoxPrefix;
+            AHNode.appendChild(commentboxprefix);
+            
+			for (var i=0; i<this.interfaces.length; i++)
+			{
+				AHNode.appendChild(this.interfaces[i].encode(root));
+			}
+			
+			for (var i=0; i<this.audioElements.length; i++) {
+				AHNode.appendChild(this.audioElements[i].encode(root));
+			}
+			// Create <CommentQuestion>
+			for (var i=0; i<this.commentQuestions.length; i++)
+			{
+				AHNode.appendChild(this.commentQuestions[i].encode(root));
+			}
+			
+			AHNode.appendChild(this.preTest.encode(root));
+            AHNode.appendChild(this.postTest.encode(root));
+			return AHNode;
+		};
+		
+		this.commentQuestionNode = function() {
+			this.id = null;
+			this.type = undefined;
+			this.options = [];
+			this.statement = undefined;
+			this.schema = specification.schema.getAllElementsByName('commentquestion')[0];
+			this.decode = function(parent,xml)
+			{
+				this.id = xml.id;
+				this.type = xml.getAttribute('type');
+				this.statement = xml.getElementsByTagName('statement')[0].textContent;
+				var optNodes = xml.getElementsByTagName('option');
+				for (var i=0; i<optNodes.length; i++)
+				{
+					var optNode = optNodes[i];
+					this.options.push({
+						name: optNode.getAttribute('name'),
+						text: optNode.textContent
+					});
+				}
+			};
+			
+			this.encode = function(root)
+			{
+				var node = root.createElement("commentquestion");
+                node.id = this.id;
+                node.setAttribute("type",this.type);
+                var statement = root.createElement("statement");
+                statement.textContent = this.statement;
+                node.appendChild(statement);
+                for (var option of this.options)
+                {
+                    var child = root.createElement("option");
+                    child.setAttribute("name",option.name);
+                    child.textContent = option.text;
+                    node.appendChild(child);
+                }
+                return node;
+			};
+		};
+		
+		this.audioElementNode = function() {
+			this.url = null;
+			this.id = null;
+			this.parent = null;
+			this.type = null;
+			this.marker = false;
+			this.enforce = false;
+			this.gain = 1.0;
+			this.schema = specification.schema.getAllElementsByName('audioelement')[0];;
+			this.parent = null;
+			this.decode = function(parent,xml)
+			{
+				this.parent = parent;
+				var attributeMap = this.schema.getAllElementsByTagName('xs:attribute');
+				for (var i=0; i<attributeMap.length; i++)
+				{
+					var attributeName = attributeMap[i].getAttribute('name') || attributeMap[i].getAttribute('ref');
+					var projectAttr = xml.getAttribute(attributeName);
+					projectAttr = specification.processAttribute(projectAttr,attributeMap[i]);
+					switch(typeof projectAttr)
+					{
+					case "number":
+					case "boolean":
+						eval('this.'+attributeName+' = '+projectAttr);
+						break;
+					case "string":
+						eval('this.'+attributeName+' = "'+projectAttr+'"');
+						break;
+					}
+				}
+				
+			};
+			this.encode = function(root)
+			{
+				var AENode = root.createElement("audioelement");
+				var attributes = this.schema.getAllElementsByTagName('xs:attribute');
+                for (var i=0; i<attributes.length; i++)
+                {
+                    var name = attributes[i].getAttribute("name");
+                    if (name == undefined) {
+                        name = attributes[i].getAttribute("ref");
+                    }
+                    if(eval("this."+name+" != undefined") || attributes[i].getAttribute("use") == "required")
+                    {
+                        eval("AENode.setAttribute('"+name+"',this."+name+")");
+                    }
+                }
+				return AENode;
+			};
+		};
+	};
+}
+			
+function Interface(specificationObject) {
+	// This handles the bindings between the interface and the audioEngineContext;
+	this.specification = specificationObject;
+	this.insertPoint = document.getElementById("topLevelBody");
+	
+	this.newPage = function(audioHolderObject,store)
+	{
+		audioEngineContext.newTestPage(audioHolderObject,store);
+		interfaceContext.deleteCommentBoxes();
+		interfaceContext.deleteCommentQuestions();
+		loadTest(audioHolderObject,store);
+	};
+	
+	// Bounded by interface!!
+	// Interface object MUST have an exportXMLDOM method which returns the various DOM levels
+	// For example, APE returns  the slider position normalised in a <value> tag.
+	this.interfaceObjects = [];
+	this.interfaceObject = function(){};
+	
+	this.resizeWindow = function(event)
+	{
+		popup.resize(event);
+		for(var i=0; i<this.commentBoxes.length; i++)
+		{this.commentBoxes[i].resize();}
+		for(var i=0; i<this.commentQuestions.length; i++)
+		{this.commentQuestions[i].resize();}
+		try
+		{
+			resizeWindow(event);
+		}
+		catch(err)
+		{
+			console.log("Warning - Interface does not have Resize option");
+			console.log(err);
+		}
+	};
+	
+	this.returnNavigator = function()
+	{
+		var node = storage.document.createElement("navigator");
+		var platform = storage.document.createElement("platform");
+		platform.textContent = navigator.platform;
+		var vendor = storage.document.createElement("vendor");
+		vendor.textContent = navigator.vendor;
+		var userAgent = storage.document.createElement("uagent");
+		userAgent.textContent = navigator.userAgent;
+        var screen = storage.document.createElement("window");
+        screen.setAttribute('innerWidth',window.innerWidth);
+        screen.setAttribute('innerHeight',window.innerHeight);
+		node.appendChild(platform);
+		node.appendChild(vendor);
+		node.appendChild(userAgent);
+        node.appendChild(screen);
+		return node;
+	};
+	
+	this.commentBoxes = [];
+	this.elementCommentBox = function(audioObject) {
+		var element = audioObject.specification;
+		this.audioObject = audioObject;
+		this.id = audioObject.id;
+		var audioHolderObject = audioObject.specification.parent;
+		// Create document objects to hold the comment boxes
+		this.trackComment = document.createElement('div');
+		this.trackComment.className = 'comment-div';
+		this.trackComment.id = 'comment-div-'+audioObject.id;
+		// Create a string next to each comment asking for a comment
+		this.trackString = document.createElement('span');
+		this.trackString.innerHTML = audioHolderObject.commentBoxPrefix+' '+audioObject.interfaceDOM.getPresentedId();
+		// Create the HTML5 comment box 'textarea'
+		this.trackCommentBox = document.createElement('textarea');
+		this.trackCommentBox.rows = '4';
+		this.trackCommentBox.cols = '100';
+		this.trackCommentBox.name = 'trackComment'+audioObject.id;
+		this.trackCommentBox.className = 'trackComment';
+		var br = document.createElement('br');
+		// Add to the holder.
+		this.trackComment.appendChild(this.trackString);
+		this.trackComment.appendChild(br);
+		this.trackComment.appendChild(this.trackCommentBox);
+		
+		this.exportXMLDOM = function() {
+			var root = document.createElement('comment');
+			if (this.audioObject.specification.parent.elementComments) {
+				var question = document.createElement('question');
+				question.textContent = this.trackString.textContent;
+				var response = document.createElement('response');
+				response.textContent = this.trackCommentBox.value;
+				console.log("Comment frag-"+this.id+": "+response.textContent);
+				root.appendChild(question);
+				root.appendChild(response);
+			}
+			return root;
+		};
+		this.resize = function()
+		{
+			var boxwidth = (window.innerWidth-100)/2;
+			if (boxwidth >= 600)
+			{
+				boxwidth = 600;
+			}
+			else if (boxwidth < 400)
+			{
+				boxwidth = 400;
+			}
+			this.trackComment.style.width = boxwidth+"px";
+			this.trackCommentBox.style.width = boxwidth-6+"px";
+		};
+		this.resize();
+	};
+	
+	this.commentQuestions = [];
+	
+	this.commentBox = function(commentQuestion) {
+		this.specification = commentQuestion;
+		// Create document objects to hold the comment boxes
+		this.holder = document.createElement('div');
+		this.holder.className = 'comment-div';
+		// Create a string next to each comment asking for a comment
+		this.string = document.createElement('span');
+		this.string.innerHTML = commentQuestion.statement;
+		// Create the HTML5 comment box 'textarea'
+		this.textArea = document.createElement('textarea');
+		this.textArea.rows = '4';
+		this.textArea.cols = '100';
+		this.textArea.className = 'trackComment';
+		var br = document.createElement('br');
+		// Add to the holder.
+		this.holder.appendChild(this.string);
+		this.holder.appendChild(br);
+		this.holder.appendChild(this.textArea);
+		
+		this.exportXMLDOM = function() {
+			var root = document.createElement('comment');
+			root.id = this.specification.id;
+			root.setAttribute('type',this.specification.type);
+			root.textContent = this.textArea.value;
+			console.log("Question: "+this.string.textContent);
+			console.log("Response: "+root.textContent);
+			return root;
+		};
+		this.resize = function()
+		{
+			var boxwidth = (window.innerWidth-100)/2;
+			if (boxwidth >= 600)
+			{
+				boxwidth = 600;
+			}
+			else if (boxwidth < 400)
+			{
+				boxwidth = 400;
+			}
+			this.holder.style.width = boxwidth+"px";
+			this.textArea.style.width = boxwidth-6+"px";
+		};
+		this.resize();
+	};
+	
+	this.radioBox = function(commentQuestion) {
+		this.specification = commentQuestion;
+		// Create document objects to hold the comment boxes
+		this.holder = document.createElement('div');
+		this.holder.className = 'comment-div';
+		// Create a string next to each comment asking for a comment
+		this.string = document.createElement('span');
+		this.string.innerHTML = commentQuestion.statement;
+		var br = document.createElement('br');
+		// Add to the holder.
+		this.holder.appendChild(this.string);
+		this.holder.appendChild(br);
+		this.options = [];
+		this.inputs = document.createElement('div');
+		this.span = document.createElement('div');
+		this.inputs.align = 'center';
+		this.inputs.style.marginLeft = '12px';
+		this.span.style.marginLeft = '12px';
+		this.span.align = 'center';
+		this.span.style.marginTop = '15px';
+		
+		var optCount = commentQuestion.options.length;
+		for (var optNode of commentQuestion.options)
+		{
+			var div = document.createElement('div');
+			div.style.width = '80px';
+			div.style.float = 'left';
+			var input = document.createElement('input');
+			input.type = 'radio';
+			input.name = commentQuestion.id;
+			input.setAttribute('setvalue',optNode.name);
+			input.className = 'comment-radio';
+			div.appendChild(input);
+			this.inputs.appendChild(div);
+			
+			
+			div = document.createElement('div');
+			div.style.width = '80px';
+			div.style.float = 'left';
+			div.align = 'center';
+			var span = document.createElement('span');
+			span.textContent = optNode.text;
+			span.className = 'comment-radio-span';
+			div.appendChild(span);
+			this.span.appendChild(div);
+			this.options.push(input);
+		}
+		this.holder.appendChild(this.span);
+		this.holder.appendChild(this.inputs);
+		
+		this.exportXMLDOM = function() {
+			var root = document.createElement('comment');
+			root.id = this.specification.id;
+			root.setAttribute('type',this.specification.type);
+			var question = document.createElement('question');
+			question.textContent = this.string.textContent;
+			var response = document.createElement('response');
+			var i=0;
+			while(this.options[i].checked == false) {
+				i++;
+				if (i >= this.options.length) {
+					break;
+				}
+			}
+			if (i >= this.options.length) {
+				response.textContent = 'null';
+			} else {
+				response.textContent = this.options[i].getAttribute('setvalue');
+				response.setAttribute('number',i);
+			}
+			console.log('Comment: '+question.textContent);
+			console.log('Response: '+response.textContent);
+			root.appendChild(question);
+			root.appendChild(response);
+			return root;
+		};
+		this.resize = function()
+		{
+			var boxwidth = (window.innerWidth-100)/2;
+			if (boxwidth >= 600)
+			{
+				boxwidth = 600;
+			}
+			else if (boxwidth < 400)
+			{
+				boxwidth = 400;
+			}
+			this.holder.style.width = boxwidth+"px";
+			var text = this.holder.children[2];
+			var options = this.holder.children[3];
+			var optCount = options.children.length;
+			var spanMargin = Math.floor(((boxwidth-20-(optCount*80))/(optCount))/2)+'px';
+			var options = options.firstChild;
+			var text = text.firstChild;
+			options.style.marginRight = spanMargin;
+			options.style.marginLeft = spanMargin;
+			text.style.marginRight = spanMargin;
+			text.style.marginLeft = spanMargin;
+			while(options.nextSibling != undefined)
+			{
+				options = options.nextSibling;
+				text = text.nextSibling;
+				options.style.marginRight = spanMargin;
+				options.style.marginLeft = spanMargin;
+				text.style.marginRight = spanMargin;
+				text.style.marginLeft = spanMargin;
+			}
+		};
+		this.resize();
+	};
+	
+	this.checkboxBox = function(commentQuestion) {
+		this.specification = commentQuestion;
+		// Create document objects to hold the comment boxes
+		this.holder = document.createElement('div');
+		this.holder.className = 'comment-div';
+		// Create a string next to each comment asking for a comment
+		this.string = document.createElement('span');
+		this.string.innerHTML = commentQuestion.statement;
+		var br = document.createElement('br');
+		// Add to the holder.
+		this.holder.appendChild(this.string);
+		this.holder.appendChild(br);
+		this.options = [];
+		this.inputs = document.createElement('div');
+		this.span = document.createElement('div');
+		this.inputs.align = 'center';
+		this.inputs.style.marginLeft = '12px';
+		this.span.style.marginLeft = '12px';
+		this.span.align = 'center';
+		this.span.style.marginTop = '15px';
+		
+		var optCount = commentQuestion.options.length;
+		for (var i=0; i<optCount; i++)
+		{
+			var div = document.createElement('div');
+			div.style.width = '80px';
+			div.style.float = 'left';
+			var input = document.createElement('input');
+			input.type = 'checkbox';
+			input.name = commentQuestion.id;
+			input.setAttribute('setvalue',commentQuestion.options[i].name);
+			input.className = 'comment-radio';
+			div.appendChild(input);
+			this.inputs.appendChild(div);
+			
+			
+			div = document.createElement('div');
+			div.style.width = '80px';
+			div.style.float = 'left';
+			div.align = 'center';
+			var span = document.createElement('span');
+			span.textContent = commentQuestion.options[i].text;
+			span.className = 'comment-radio-span';
+			div.appendChild(span);
+			this.span.appendChild(div);
+			this.options.push(input);
+		}
+		this.holder.appendChild(this.span);
+		this.holder.appendChild(this.inputs);
+		
+		this.exportXMLDOM = function() {
+			var root = document.createElement('comment');
+			root.id = this.specification.id;
+			root.setAttribute('type',this.specification.type);
+			var question = document.createElement('question');
+			question.textContent = this.string.textContent;
+			root.appendChild(question);
+			console.log('Comment: '+question.textContent);
+			for (var i=0; i<this.options.length; i++) {
+				var response = document.createElement('response');
+				response.textContent = this.options[i].checked;
+				response.setAttribute('name',this.options[i].getAttribute('setvalue'));
+				root.appendChild(response);
+				console.log('Response '+response.getAttribute('name') +': '+response.textContent);
+			}
+			return root;
+		};
+		this.resize = function()
+		{
+			var boxwidth = (window.innerWidth-100)/2;
+			if (boxwidth >= 600)
+			{
+				boxwidth = 600;
+			}
+			else if (boxwidth < 400)
+			{
+				boxwidth = 400;
+			}
+			this.holder.style.width = boxwidth+"px";
+			var text = this.holder.children[2];
+			var options = this.holder.children[3];
+			var optCount = options.children.length;
+			var spanMargin = Math.floor(((boxwidth-20-(optCount*80))/(optCount))/2)+'px';
+			var options = options.firstChild;
+			var text = text.firstChild;
+			options.style.marginRight = spanMargin;
+			options.style.marginLeft = spanMargin;
+			text.style.marginRight = spanMargin;
+			text.style.marginLeft = spanMargin;
+			while(options.nextSibling != undefined)
+			{
+				options = options.nextSibling;
+				text = text.nextSibling;
+				options.style.marginRight = spanMargin;
+				options.style.marginLeft = spanMargin;
+				text.style.marginRight = spanMargin;
+				text.style.marginLeft = spanMargin;
+			}
+		};
+		this.resize();
+	};
+
+	this.createCommentBox = function(audioObject) {
+		var node = new this.elementCommentBox(audioObject);
+		this.commentBoxes.push(node);
+		audioObject.commentDOM = node;
+		return node;
+	};
+	
+	this.sortCommentBoxes = function() {
+		this.commentBoxes.sort(function(a,b){return a.id - b.id;});
+	};
+	
+	this.showCommentBoxes = function(inject, sort) {
+		if (sort) {interfaceContext.sortCommentBoxes();}
+		for (var box of interfaceContext.commentBoxes) {
+			inject.appendChild(box.trackComment);
+		}
+	};
+	
+	this.deleteCommentBoxes = function() {
+		this.commentBoxes = [];
+	};
+	
+	this.createCommentQuestion = function(element) {
+		var node;
+		if (element.type == 'question') {
+			node = new this.commentBox(element);
+		} else if (element.type == 'radio') {
+			node = new this.radioBox(element);
+		} else if (element.type == 'checkbox') {
+			node = new this.checkboxBox(element);
+		}
+		this.commentQuestions.push(node);
+		return node;
+	};
+	
+	this.deleteCommentQuestions = function()
+	{
+		this.commentQuestions = [];
+	};
+	
+	this.playhead = new function()
+	{
+		this.object = document.createElement('div');
+		this.object.className = 'playhead';
+		this.object.align = 'left';
+		var curTime = document.createElement('div');
+		curTime.style.width = '50px';
+		this.curTimeSpan = document.createElement('span');
+		this.curTimeSpan.textContent = '00:00';
+		curTime.appendChild(this.curTimeSpan);
+		this.object.appendChild(curTime);
+		this.scrubberTrack = document.createElement('div');
+		this.scrubberTrack.className = 'playhead-scrub-track';
+		
+		this.scrubberHead = document.createElement('div');
+		this.scrubberHead.id = 'playhead-scrubber';
+		this.scrubberTrack.appendChild(this.scrubberHead);
+		this.object.appendChild(this.scrubberTrack);
+		
+		this.timePerPixel = 0;
+		this.maxTime = 0;
+		
+		this.playbackObject;
+		
+		this.setTimePerPixel = function(audioObject) {
+			//maxTime must be in seconds
+			this.playbackObject = audioObject;
+			this.maxTime = audioObject.buffer.buffer.duration;
+			var width = 490; //500 - 10, 5 each side of the tracker head
+			this.timePerPixel = this.maxTime/490;
+			if (this.maxTime < 60) {
+				this.curTimeSpan.textContent = '0.00';
+			} else {
+				this.curTimeSpan.textContent = '00:00';
+			}
+		};
+		
+		this.update = function() {
+			// Update the playhead position, startPlay must be called
+			if (this.timePerPixel > 0) {
+				var time = this.playbackObject.getCurrentPosition();
+				if (time > 0 && time < this.maxTime) {
+					var width = 490;
+					var pix = Math.floor(time/this.timePerPixel);
+					this.scrubberHead.style.left = pix+'px';
+					if (this.maxTime > 60.0) {
+						var secs = time%60;
+						var mins = Math.floor((time-secs)/60);
+						secs = secs.toString();
+						secs = secs.substr(0,2);
+						mins = mins.toString();
+						this.curTimeSpan.textContent = mins+':'+secs;
+					} else {
+						time = time.toString();
+						this.curTimeSpan.textContent = time.substr(0,4);
+					}
+				} else {
+					this.scrubberHead.style.left = '0px';
+					if (this.maxTime < 60) {
+						this.curTimeSpan.textContent = '0.00';
+					} else {
+						this.curTimeSpan.textContent = '00:00';
+					}
+				}
+			}
+		};
+		
+		this.interval = undefined;
+		
+		this.start = function() {
+			if (this.playbackObject != undefined && this.interval == undefined) {
+				if (this.maxTime < 60) {
+					this.interval = setInterval(function(){interfaceContext.playhead.update();},10);
+				} else {
+					this.interval = setInterval(function(){interfaceContext.playhead.update();},100);
+				}
+			}
+		};
+		this.stop = function() {
+			clearInterval(this.interval);
+			this.interval = undefined;
+			if (this.maxTime < 60) {
+				this.curTimeSpan.textContent = '0.00';
+			} else {
+				this.curTimeSpan.textContent = '00:00';
+			}
+		};
+	};
+    
+    this.volume = new function()
+    {
+        // An in-built volume module which can be viewed on page
+        // Includes trackers on page-by-page data
+        // Volume does NOT reset to 0dB on each page load
+        this.valueLin = 1.0;
+        this.valueDB = 0.0;
+        this.object = document.createElement('div');
+        this.object.id = 'master-volume-holder';
+        this.slider = document.createElement('input');
+        this.slider.id = 'master-volume-control';
+        this.slider.type = 'range';
+        this.valueText = document.createElement('span');
+        this.valueText.id = 'master-volume-feedback';
+        this.valueText.textContent = '0dB';
+        
+        this.slider.min = -60;
+        this.slider.max = 12;
+        this.slider.value = 0;
+        this.slider.step = 1;
+        this.slider.onmousemove = function(event)
+        {
+            interfaceContext.volume.valueDB = event.currentTarget.value;
+            interfaceContext.volume.valueLin = decibelToLinear(interfaceContext.volume.valueDB);
+            interfaceContext.volume.valueText.textContent = interfaceContext.volume.valueDB+'dB';
+            audioEngineContext.outputGain.gain.value = interfaceContext.volume.valueLin;
+        }
+        this.slider.onmouseup = function(event)
+        {
+            var storePoint = testState.currentStore.XMLDOM.children[0].getAllElementsByName('volumeTracker');
+            if (storePoint.length == 0)
+            {
+                storePoint = storage.document.createElement('metricresult');
+                storePoint.setAttribute('name','volumeTracker');
+                testState.currentStore.XMLDOM.children[0].appendChild(storePoint);
+            }
+            else {
+                storePoint = storePoint[0];
+            }
+            var node = storage.document.createElement('movement');
+            node.setAttribute('test-time',audioEngineContext.timer.getTestTime());
+            node.setAttribute('volume',interfaceContext.volume.valueDB);
+            node.setAttribute('format','dBFS');
+            storePoint.appendChild(node);
+        }
+        
+        var title = document.createElement('div');
+        title.innerHTML = '<span>Master Volume Control</span>';
+        title.style.fontSize = '0.75em';
+        title.style.width = "100%";
+        title.align = 'center';
+        this.object.appendChild(title);
+        
+        this.object.appendChild(this.slider);
+        this.object.appendChild(this.valueText);
+    }
+	// Global Checkers
+	// These functions will help enforce the checkers
+	this.checkHiddenAnchor = function()
+	{
+		for (var ao of audioEngineContext.audioObjects)
+		{
+			if (ao.specification.type == "anchor")
+			{
+				if (ao.interfaceDOM.getValue() > (ao.specification.marker/100) && ao.specification.marker > 0) {
+					// Anchor is not set below
+					console.log('Anchor node not below marker value');
+					alert('Please keep listening');
+                    this.storeErrorNode('Anchor node not below marker value');
+					return false;
+				}
+			}
+		}
+		return true;
+	};
+	
+	this.checkHiddenReference = function()
+	{
+		for (var ao of audioEngineContext.audioObjects)
+		{
+			if (ao.specification.type == "reference")
+			{
+				if (ao.interfaceDOM.getValue() < (ao.specification.marker/100) && ao.specification.marker > 0) {
+					// Anchor is not set below
+					console.log('Reference node not above marker value');
+                    this.storeErrorNode('Reference node not above marker value');
+					alert('Please keep listening');
+					return false;
+				}
+			}
+		}
+		return true;
+	};
+	
+	this.checkFragmentsFullyPlayed = function ()
+	{
+		// Checks the entire file has been played back
+		// NOTE ! This will return true IF playback is Looped!!!
+		if (audioEngineContext.loopPlayback)
+		{
+			console.log("WARNING - Looped source: Cannot check fragments are fully played");
+			return true;
+		}
+		var check_pass = true;
+		var error_obj = [];
+		for (var i = 0; i<audioEngineContext.audioObjects.length; i++)
+		{
+			var object = audioEngineContext.audioObjects[i];
+			var time = object.buffer.buffer.duration;
+			var metric = object.metric;
+			var passed = false;
+			for (var j=0; j<metric.listenTracker.length; j++)
+			{
+				var bt = metric.listenTracker[j].getElementsByTagName('buffertime');
+				var start_time = Number(bt[0].getAttribute('start'));
+				var stop_time = Number(bt[0].getAttribute('stop'));
+				var delta = stop_time - start_time;
+				if (delta >= time)
+				{
+					passed = true;
+					break;
+				}
+			}
+			if (passed == false)
+			{
+				check_pass = false;
+				console.log("Continue listening to track-"+audioEngineContext.audioObjects.interfaceDOM.getPresentedId());
+				error_obj.push(audioEngineContext.audioObjects.interfaceDOM.getPresentedId());
+			}
+		}
+		if (check_pass == false)
+		{
+			var str_start = "You have not completely listened to fragments ";
+			for (var i=0; i<error_obj.length; i++)
+			{
+				str_start += error_obj[i];
+				if (i != error_obj.length-1)
+				{
+					str_start += ', ';
+				}
+			}
+			str_start += ". Please keep listening";
+			console.log("[ALERT]: "+str_start);
+            this.storeErrorNode("[ALERT]: "+str_start);
+			alert(str_start);
+		}
+	};
+	this.checkAllMoved = function()
+	{
+		var str = "You have not moved ";
+		var failed = [];
+		for (var ao of audioEngineContext.audioObjects)
+		{
+			if(ao.metric.wasMoved == false && ao.interfaceDOM.canMove() == true)
+			{
+				failed.push(ao.interfaceDOM.getPresentedId());
+			}
+		}
+		if (failed.length == 0)
+		{
+			return true;
+		} else if (failed.length == 1)
+		{
+			str += 'track '+failed[0];
+		} else {
+			str += 'tracks ';
+			for (var i=0; i<failed.length-1; i++)
+			{
+				str += failed[i]+', ';
+			}
+			str += 'and '+failed[i];
+		}
+		str +='.';
+		alert(str);
+		console.log(str);
+        this.storeErrorNode(str);
+		return false;
+	};
+	this.checkAllPlayed = function()
+	{
+		var str = "You have not played ";
+		var failed = [];
+		for (var ao of audioEngineContext.audioObjects)
+		{
+			if(ao.metric.wasListenedTo == false)
+			{
+				failed.push(ao.interfaceDOM.getPresentedId());
+			}
+		}
+		if (failed.length == 0)
+		{
+			return true;
+		} else if (failed.length == 1)
+		{
+			str += 'track '+failed[0];
+		} else {
+			str += 'tracks ';
+			for (var i=0; i<failed.length-1; i++)
+			{
+				str += failed[i]+', ';
+			}
+			str += 'and '+failed[i];
+		}
+		str +='.';
+		alert(str);
+		console.log(str);
+        this.storeErrorNode(str);
+		return false;
+	};
+    
+    this.storeErrorNode = function(errorMessage)
+    {
+        var time = audioEngineContext.timer.getTestTime();
+        var node = storage.document.createElement('error');
+        node.setAttribute('time',time);
+        node.textContent = errorMessage;
+        testState.currentStore.XMLDOM.appendChild(node);
+    };
+}
+
+function Storage()
+{
+	// Holds results in XML format until ready for collection
+	this.globalPreTest = null;
+	this.globalPostTest = null;
+	this.testPages = [];
+	this.document = document.implementation.createDocument(null,"waetresult");
+	this.root = this.document.children[0];
+	this.state = 0;
+	
+	this.initialise = function()
+	{
+		if (specification.preTest != undefined){this.globalPreTest = new this.surveyNode(this,this.root,specification.preTest);}
+		if (specification.postTest != undefined){this.globalPostTest = new this.surveyNode(this,this.root,specification.postTest);}
+	};
+	
+	this.createTestPageStore = function(specification)
+	{
+		var store = new this.pageNode(this,specification);
+		this.testPages.push(store);
+		return this.testPages[this.testPages.length-1];
+	};
+	
+	this.surveyNode = function(parent,root,specification)
+	{
+		this.specification = specification;
+		this.parent = parent;
+		this.XMLDOM = this.parent.document.createElement('survey');
+		this.XMLDOM.setAttribute('location',this.specification.location);
+		for (var optNode of this.specification.options)
+		{
+			if (optNode.type != 'statement')
+			{
+				var node = this.parent.document.createElement('surveyresult');
+				node.id = optNode.id;
+				node.setAttribute('type',optNode.type);
+				this.XMLDOM.appendChild(node);
+			}
+		}
+		root.appendChild(this.XMLDOM);
+		
+		this.postResult = function(node)
+		{
+			// From popup: node is the popupOption node containing both spec. and results
+			// ID is the position
+			if (node.specification.type == 'statement'){return;}
+			var surveyresult = this.parent.document.getElementById(node.specification.id);
+			switch(node.specification.type)
+			{
+			case "number":
+			case "question":
+				var child = this.parent.document.createElement('response');
+				child.textContent = node.response;
+				surveyresult.appendChild(child);
+				break;
+			case "radio":
+				var child = this.parent.document.createElement('response');
+				child.setAttribute('name',node.response.name);
+				child.textContent = node.response.text;
+				surveyresult.appendChild(child);
+				break;
+			case "checkbox":
+				for (var i=0; i<node.response.length; i++)
+				{
+					var checkNode = this.parent.document.createElement('response');
+					checkNode.setAttribute('name',node.response[i].name);
+					checkNode.setAttribute('checked',node.response[i].checked);
+					surveyresult.appendChild(checkNode);
+				}
+				break;
+			}
+		};
+	};
+	
+	this.pageNode = function(parent,specification)
+	{
+		// Create one store per test page
+		this.specification = specification;
+		this.parent = parent;
+		this.XMLDOM = this.parent.document.createElement('page');
+		this.XMLDOM.setAttribute('id',specification.id);
+		this.XMLDOM.setAttribute('presentedId',specification.presentedId);
+		if (specification.preTest != undefined){this.preTest = new this.parent.surveyNode(this.parent,this.XMLDOM,this.specification.preTest);}
+		if (specification.postTest != undefined){this.postTest = new this.parent.surveyNode(this.parent,this.XMLDOM,this.specification.postTest);}
+		
+		// Add any page metrics
+		var page_metric = this.parent.document.createElement('metric');
+		this.XMLDOM.appendChild(page_metric);
+		
+		// Add the audioelement
+		for (var element of this.specification.audioElements)
+		{
+			var aeNode = this.parent.document.createElement('audioelement');
+			aeNode.id = element.id;
+			aeNode.setAttribute('type',element.type);
+			aeNode.setAttribute('url', element.url);
+			aeNode.setAttribute('gain', element.gain);
+			if (element.type == 'anchor' || element.type == 'reference')
+			{
+				if (element.marker > 0)
+				{
+					aeNode.setAttribute('marker',element.marker);
+				}
+			}
+			var ae_metric = this.parent.document.createElement('metric');
+			aeNode.appendChild(ae_metric); 
+			this.XMLDOM.appendChild(aeNode);
+		}
+		
+		// Add any commentQuestions
+		for (var element of this.specification.commentQuestions)
+		{
+			var cqNode = this.parent.document.createElement('commentquestion');
+			cqNode.id = element.id;
+			cqNode.setAttribute('type',element.type);
+			var statement = this.parent.document.createElement('statement');
+			statement.textContent = cqNode.statement;
+			cqNode.appendChild(statement);
+			var response = this.parent.document.createElement('response');
+			cqNode.appendChild(response);
+			this.XMLDOM.appendChild(cqNode);
+		}
+		
+		this.parent.root.appendChild(this.XMLDOM);
+	};
+	this.finish = function()
+	{
+		if (this.state == 0)
+		{
+			var projectDocument = specification.projectXML;
+			projectDocument.setAttribute('file-name',url);
+			this.root.appendChild(projectDocument);
+			this.root.appendChild(returnDateNode());
+			this.root.appendChild(interfaceContext.returnNavigator());
+		}
+		this.state = 1;
+		return this.root;
+	};
+}