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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 gate. If nothing is plugged into the space of 5 out_working_increment = working_increment * 4 / 5; row_2 = row_1 + v_margin + 12; //knob_radius top_row = height - v_margin; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff working_height = height - v_margin - title_font; saw_out = [h_margin + working_width/4, row_1, 0]; fm_pot = [input_column + h_margin/2, bottom_row, 0]; c_tune = [second_col, fourth_row, 0]; pwm_in = [first_col, fourth_row, 0]; triangle_out = [third_col, fifth_row, 0]; pwm_duty = [second_col, first_row, 0]; //Second row interface placement f_tune = [width_mm/2 + h_margin, top_row, 0]; left_rib_x .

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