CoD always has fail glitches when it comes to sound and shizzle, like in CoD4 if ur mic wasn't plugged in properly then it would crash all the time. Maybe you need to get rid of all your sound drivers and re-install em. Or delete one of the cod config files, dunno which one you might need to check that :S or re-install the game which would be a bitch :P

But really its just down to the fact that fail console port is fail... it prob doesn't support awesome sound because it is epic fail