OptionalattacksOptionaldecaysOptionalpointsTransfer function points: "dBin/dBout ..."
Optionalsoft_Soft knee. Default: 0.01
OptionalgainGain to apply before companding
Optionalinitial_Initial volume. Default: 0
OptionaldelayDelay. Default: 0
Attack/decay times: "t1,t2 t3,t4 ..."