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Go standard library, which is what MK 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 on PCB From 6f5ee76aea5e7cdfb79e86a703d20d48842d1955 Mon Sep 17 00:00:00 2001 Subject: [PATCH] Notes about component heights, swapping rotary and toggle .../Unseen Servant/Unseen Servant.kicad_sch | 1 | B20k | Potentiometer | | | | Tayda | A-1955 | | | U1 | 1 | B10k .