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Explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the bottom of box [right_edge, -extra_depth], // bottom right [right_edge, rotate_vector_sin * height + rotate_vector_sin * rail_depth] // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom horizontal rib h_wall(h=4, l=right_rib_x); // middle horizontal rib // h_wall(h=4, l=right_rib_x); // one more vertical to mount a circuit board to, dead center v_wall(h=4, l=top_row-rail_clearance*2-thickness-15); // PCB holder main MK_VCO/Panels/Font files/Futura XBlk BT.ttf | Bin 0 -> 11916 bytes.

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