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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 | 10k | Resistor | | | | | | J3 | 1 | 3_pin_Molex_header | 3 | A1M | Potentiometer | | | | | Tayda | A-3588 | \** Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | | | L1 | 1 | LED .

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