Dual ADSR

The circuit is based in part on the Roland SH-101 / System100m design with several enhancements.

-Manual GATE buttons
-Three timing ranges: (1 second, 10second, 1minute A/D times)
-Normal and inverted outputs
-End of Decay (EOD) logic output
-Cycle mode (which GATE logic control)
-Retrig input (allows re-triggering of the envelope if source gate held high)
- Dynamic control of the envelope output level (each ADSR is routed through a linear VCA and the control is normalled to +5V via the LEVEL jack. You can patch another control source like an LFO or VELOCITY level from a keyboard to this jack.