envelopeStageInt function
Implementation
int envelopeStageInt(EnvelopeStage s) {
switch(s){
case EnvelopeStage.delay: return 0;
case EnvelopeStage.attack: return 1;
case EnvelopeStage.hold: return 2;
case EnvelopeStage.decay: return 3;
case EnvelopeStage.release: return 4;
}
}