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BackWork). Probably can build our own based on https://www.schmitzbits.de/ms20.html which is what MK uses a CA3080 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 | 47k | Resistor | | | S1 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8