yea, it'll be in your sound drivers. ive got my back speakers at 70% and my front speakers at 30% just because the back speakers are further away.
what type of sound card is it? ive got an audigy 4 pro, if you've got integrated sound i'd upgrade to an audigy or an X-Fi just for the drivers that they use, they're awesome.
lol they've even got a setting to change the voices into chipmunks its pretty funny... works the way it should too haha