I'm using this circuit for my project, which I referred from https://www.sparkfun.com/news/1396.
I don't really understand how current works in GPIO pins, so the question is: instead of connecting them to pin 4, 6, 7, can I connect them to pin 4, 6, 12? as I need control over the brightness of LED and it seems I can only do that through the PCM_CLK pin.
Thanks!