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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 main 5a4e89eea6 Add position for resistor between coarse and +12V, value Fireball/Fireball.kicad_sch | 1313 This won't be easy; need both A1M (x3) and B10K (x1) sliders in the Source Code Form.

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