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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 Internal clock with manual control. - Clock rate goes down when resistance goes up, opposite to expectation. C1 is too small for film; is film needed? - Smaller cap (476nF?) for C1 .

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