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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 example modules Latest commits for file Schematics/SynthMages.pretty/Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHoles_Shaft_Centered.kicad_mod Latest commits for file Panels/fireball_vco_14hp_v1.scad adds front panel design and includes 2.5mm centerward shift for input and output jacks input_column = h_margin; working_height = height - 25; // build up.

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