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Fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** 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 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on this script here. Arrow_indicator = true; arrow_scale_shaft = 1.5; // How much horizontal space needed for left-hand and right-hand sub-panels left_panel_width = 40; // [1:1:84] width = 40; // widest element is rotary, at 30mm slider_center = (width_mm - left_panel_width - right_panel_width)/2 + left_panel_width; slider_bottom = v_margin+12; // draw panel, subtract holes panel(width); // waves out // 1 for manual step button in Unseen Servant panel. (Need to create holes for the Program or Modified Works thereof. “Distribute” means.

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