Web Audio Evaluation Tool

If running a test with a large group of participants and you want every participant to only assess 4 out of 20 sets of sounds, would be nice if this is automated. E.g. in synthesis realism assessment task Alice gets 'fire', 'rain', 'gunshot', 'door'; Bob gets 'footstep, 'wind', 'fire', 'gunshot' and so on.
At the moment, one has to make a separate file for every participant and predetermine the pages to include (which can be randomly but manually selected).