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Cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a narrow space between them right_panel_width = 12; // [1:1:84] //Second row interface placement pwm_in = [width_mm - h_margin - working_width/8, row_4, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_4, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_2, 0]; audio_in_2 = [left_col, row_6, 0]; audio_in_1 = [left_col, row_3, 0]; cv_in_2b = [right_col, row_1, 0]; square_out = [third_col, fifth_row, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_3, 0]; c_tune = [second_col, third_row, 0]; saw_out = [output_column, row_1, 0]; triangle_out = [output_column, row_2, 0]; fm_lvl = [h_margin+working_width/8, row_2, 0]; fm_lvl = [second_col, second_row, 0]; //Third row interface placement saw_out = [h_margin + working_width/4, row_1, 0]; left_rib_x = hole_dist_side + thickness; width_mm = hp_mm(width); // where to put the output jacks triangle_out = [third_col, fifth_row, 0]; //right_rib_x = width_mm - h_margin; left_rib_x = thickness * 2; right_rib_x = width_mm - thickness*2; // draw panel, subtract holes.

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