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** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else 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 schematic start, and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a result of switching to pcb-mounted panel components version

main VCA/Panels/dual_vca.scad 393 lines $fn=FN; footprint_depth = .25; //non-printing, barely-visible outline of component footprints width = 40; // widest element is rotary, at 30mm right_panel_width = width_mm - thickness*2; left_rib_x = thickness * 2; right_rib_x = width_mm - h_margin; cv_in = [input_column, row_2, 0]; pwm_in = [input_column - h_margin/2, row_1, 0]; fm_pot = [input_column + h_margin/2, bottom_row, 0]; c_tune = [second_col, first_row, 0]; c_tune = [second_col, third_row, 0]; saw_out = [output_column, row_2, 0]; square_out = [third_col, fourth_row, 0]; //Fifth row interface placement fm_in = [first_col, third_row, 0]; //Fourth row interface placement sync_in = [first_col, first_row, 0]; c_tune = [width_mm/2, top_row, 0]; left_rib_x.

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