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For 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 right sub-panel //special-case the knob main shape. [mm] // Height of module (HP) width = 17; // [1:1:84] //Second row interface placement saw_out = [third_col, third_row, 0]; //Fourth row interface placement f_tune = [second_col, fifth_row, 0]; square_out = [third_col, fourth_row, 0]; triangle_out = [output_column, row_1, 0]; fm_pot = [input_column + h_margin/2, bottom_row, 0]; pwm_pot = [input_column - h_margin/2, bottom_row, 0]; pwm_pot = [input_column - h_margin/2, row_1, 0]; right_rib_x = width_mm - thickness*2.2; left_rib_x = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y.

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