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One 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 schematic start, and some example modules Latest commits for file Envelope/Envelope.kicad_sch master PSU/Synth Mages Power Word Stun Panel.kicad_pro Add simplest muscescore example.

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