Envelope Generator

A simple one channel envelope generator with exponential attack and decay, sustain option, and looping capability.

Inputs and Outputs

digital in: trigger an envelope
analog in: added to knob 2 to determine fall time
button 1: change sustain mode between AR (Attack Release) and ASR (Attack Sustain Release)
button 2: change looping mode between Once and Loop (Loop mode overrides sustain mode to AR)
knob 1: rise time
knob 2: fall time
cv 1: a copy of the digital input
cv 2: the generated envelope
cv 3: the inversion of the generated envelope
cv 4: a gate that is high whenever the envelope is in a sustain state
cv 5: a 10ms end-of-rise trigger
cv 6: a 10ms end-of-fall trigger

The 10ms end-of-rise trigger will fire every time the envelope transitions from the rising to either the falling or sustain states. This can occur as a result of the incoming gate signal dropping low while a slow rise is still being processed.

The 10ms end-of-fall trigger will only fire if the full duration of the fall portion is reached; if the envelope is re-triggered before the fall completes, this trigger will not fire.