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BackOTA, 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 .../OttosIrresistableDance.kicad_sch | 5 create mode 100755 VCO_MANUAL_v2.pdf