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OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 1M | Resistor | | | | | | | R16, R18, R26 | 3 | A1M | **Potentiometer, 9 mm vertical pots. You.

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