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).
Steady state amplitude.
One of "sine", "sawtooth", "triangle", "square" or "custom" if periodicWave is set.
Parameters for the timbre and ADSR envelope of the synth.