row_2 = row_1 + v_margin + 12; //knob_radius top_row = height - v_margin*2 - title_font_size*1.5; // surface("FireballSpellSmall.png", center=true, invert=false); More experimentation with panel title fonts Untested hardware and software — Do not connect the Normal pin for op amp in schmidt inverter mode, maybe both 7808.