300 tracks eh?

looks like you're stuck with analog line-in recording actually, as music from xbox games is pretty hard to extract any other way.

http://club.cdfreaks.com/lite/t-107518.html

i was wrong, you can't just use a game in your normal dvd-rom drive, you would have to use a modded xbox, rip the game to the hard drive, and ftp the game's files off to your pc. but even then, it's all custom for each game, so the sound files might be embedded into other files and stuff.