here it is:
http://forums.pimoroni.com/t/unicorn-phat-incompatible-with-retropie/2345/11
… very much the same principle really, I thought they’d be some additional tricks required. Well, obviously if you want the leds to react to the music there’s a fair bit more than just getting them up and running independly.
I agree it would make good material for a learning article… I’ll add it down on ‘The List’.