A threshold (delta) is added in the peak picking parameters structure (PPickParams). It is used as an offset when computing the smoothed detection function. A constructor for the structure PPickParams is also added to set the parameters to 0 when a structure instance is created. Hence programmes using the peak picking parameter structure and which do not set the delta parameter (e.g. QM Vamp note onset detector) won't be affected by the modifications. Functions modified: - dsp/onsets/PeakPicking.cpp - dsp/onsets/PeakPicking.h - dsp/signalconditioning/DFProcess.cpp - dsp/signalconditioning/DFProcess.h