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10?) Breadboard MK's 5-note to 8-note. Expanding out to 8 notes means ~$16-20 in parts, needing only one tl074 and support Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb.

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