The input signal.
The size of the grain window in seconds. (init-time only)
The ratio of the pitch shift. Must be from 0 to 4.
The maximum random deviation of the pitch from the pitchRatio.
A random offset of from zero to timeDispersion seconds is added to the delay of each grain. Use of some dispersion can alleviate a hard comb filter effect due to uniform grain placement. It can also be an effect in itself. timeDispersion can be no larger than windowSize.