Not sure how many people on here have ever played a PS3 game that allowed you to play you're own choice of music in the background from music stored on your PS3.
I've played a few fighting games like Street Fighter and Skullgirls that allow this and it's always a feature I love in games that allow it.
I mean it would be pretty awesome to battle out to some of the epic music from some games like MediEvil or even just to your favourite songs that you may think are appropriate for an all star battle.
Wait does it support it or not?
No. It doesn't unfortunately. Although, some boxes of the game advertise custom soundtracks for some reason.
Yeah... Someone posted a pic of the box that said it supports it too. Was disappointed.