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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 Hardware/lib/Kosmo_panel | 2 | 1M | Resistor | | R21, R22, R23 | 3 | 4.7k | Resistor | | R9, R11, R13 | 3 | A1M | Potentiometer | | R31 | 1 | 4.7 uF | Unpolarized capacitor | | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Binary.

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