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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 pin Molex header 2.54 mm spacing D 3 pin Molex header 2.54 mm spacing R23, R24, R25, R27 Switch, triple pole double throw D Switch, single pole double throw Precision Timers, 555 compatible, PDIP-8 | | | | Screws, nuts, and spacers (see [build notes](build.md | | U2.

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