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Going digital ** https://note.com/solder_state/n/nde97a0516f03 and https://www.youtube.com/watch?v=op_DhPr2goc ** 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 = width_mm - h_margin; out_row_1 = v_margin+12; out_row_2 = working_increment*1 + out_row_1; out_row_7 = working_increment*6 + out_row_1; out_row_3 = working_increment*2 + row_1; row_4 = row_3 + vertical_space/7; row_5 = row_4 + vertical_space/7; row_4 = working_increment*3 + row_1; row_4 = row_3 + vertical_space/7; row_5 = working_increment*4.

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