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That 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 supporting components. ~$6 in parts, depending on PCB with exploratory 8hp layout PSU/Synth Mages Power Word Stun Panel.kicad_pcb | 1216 Synth Mages Power Word Stun.kicad_pro PSU \+12V, -12V and ground needed, probably.

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