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This is the stock Sparkfun MP3 shield VS1063, and I’m using it with an Arduino UNO. I switched the pin from 9 to A5, which worked, but I have to write PWM to these pins, and I think the analog pins can’t do that (or can’t do that as easily.) When I try to connect the lights to pins 11-13, they don’t get the right data passed to them. Is there a reason I can’t use these pins?

On the upside, the MP3 player works now!