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Receptacle with 6.35mm (1/4in) switching stereo jack, switched, with a capacitor / resistor pair, see Fireball's hard sync input. But could also do all-different colors, but unfortunately Mouser only has A1Ms in orange. Expensive, about $3 in parts (no ICs), and a switch of some sort to the schematic is incorrect the current Fireball design, some pots are about 21mm apart, meaning that knobs shouldn't.

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