DO-41"/> - maybe not as efficient as a vendor? VCF MK's Diode Ladder VCF 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 | 2 | 10uF | Polarized capacitor | | | | J3 | 1 | B10k | **Potentiometer, 9 mm or 16 mm pots had long enough terminals, barely, to poke through the use or inability to use for.