BF2S Forums help (can't get 5.1 sound in iTunes from my Logitech x540's)

Your music is only stereo, whereas games and your DVD's/some of your downloaded movies actually have 5 channels of audio. Creative soundcards have cmss that forces stereo sound to work as 5.1, and some media players let you decide yourself how you want to map the channels(media player classic). I doubt iTunes would have a feature like that, though.