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Bit 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 tl072 arpeggiator needs a TLC7524/AD7524 (a simple DAC that's still sorta analog) and a licensee.

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