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BackAs toggle switch could be done externally with a diode matrix to select segments from each step. Could add a voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a nut behind the front panel design and includes 2.5mm centerward shift for input and output jacks row_2 = row_1 + v_margin + 12; title_font = 10; // If you use 9 mm vertical board mount | | | | U2 | 1 | TL074 | Quad operational amplifier, DIP-14