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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 mainly on whether 8+6 pins + hardware fits on shaek board or similar size perf. MiniADSR derived from Schmitz's FEitW maybe simpler? Or just updated to the thickness of 2mm // for cylinder indentations, set the quantity, quality, radius, height.

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