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Back— Do not connect the Normal pin for op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules schematic start, and some example modules schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 | 47k | Resistor | | S1 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)"/>