My Charger (08 SXT) came with the MyGig and MP3 campatability, I plugged my MP3 player in and it would not play. I'm very uneducated with this system so forgive my lack of knowledge. Is this system only compatible with certain MP3 players? I plugged my USB cable into my MP3, then plugged it into the USB dock in my dash, and selected it on my touch screen, but no dice. Any help would be appreciated. My MP3 is a Samsung YP7 if that makes any difference at all.