Attack time in seconds.
Audio delay in seconds. Increase on Firefox to reduce pops.
Decay time constant (exponential decay from 1 to sustainLevel).
Optional periodicCustom waveform.
Release time constant (exponential decay from sustainLevel to 0).
Spread of voice frequencies in ±Hertz.
Number of voices to play in unison.
Steady state amplitude.
One of "sine", "sawtooth", "triangle", "square" or "custom" if periodicWave is set.
Parameters for the timbre, ADSR and voice stack of the synth.