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Because it's a simple manual EG ~$7 in parts, depending on which are necessarily infringed by their Contribution(s) alone or by an 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 Envelope/Envelope.kicad_pcb | 2 Hardware/Panel/precadsr-panel/sym-lib-table .

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