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  1. Re: Need to drive 4 rgb leds, but have only 1 pin available...

    You missed the point...
    Use same RC circuit to drive APA LED. Apa have Data and Clock pin and you have one pin free.
  2. Re: Need to drive 4 rgb leds, but have only 1 pin available...

    Not necessary, you can create clock and data using only one pin.
    eg
    https://www.romanblack.com/shift1.htm
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