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Back0]; fm_lvl = [second_col, first_row, 0]; c_tune = [second_col, fifth_row, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_3, 0]; left_rib_x = 0; right_rib_x = width_mm - 10 LEDs - Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp