Polykit VCA-ADSR This repository contains schematics and PCB layout for a board with a VCA and an ADSR on it. Schematics VCA ADSR References https://www.schmitzbits.de/adsr.html https://yusynth.net/Modular/EN/VCA/index.html https://kassu2000.blogspot.com/2015/10/vca.html