dont know, but i popped in my SD card at work, so now i can listen to metal all day long. nobody seems to notice or ask if its not the same soundtrack, so there might be some people out there who think dimmu borgir is part of the normal excitetruck soundtrack
Custom Soundtracks? You're mistaken, that is for loading/saving the game.
(Remember when everyone was saying that?)
I don't know of any yet, but hopefully we'll see more games that support it. Out of curiosity, how do you get music onto an SD card? Would we have to buy some sort of SD reader that attaches to the PC via USB?