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BackOn amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to the integrator Op-Amp (U3-10). Cut the current 12-position rotary switches with 4 positions D.
- Possible mini toggle: 2.5mm above panel, tight.
- (https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/packaging/04r00476-02.pdf), generated with kicad-footprint-generator Samtec.