I have a gametheater xp and 4.1 speaker system. I can only get sound from 2 speakers. How do I config my system (redhat) to use all four?

I've searched everywhere for a solution, havent found anything.

Well, try loading up 'alsamixergui' rpm and have at it. You will see the mixer adjustments via that program. If you have Mandrake 9.2, the KDE mixer has made leaps and bounds from the old one. You should be able to make adjustments to your speakers if you have them connected to your blue outboard box. I've not got mine set up like that though. I have the optical output from the blue box to my amp, and adjust the sound on the amp. I occaisionly get a 'digital dobly' light on my amp when playing DVDs. Haven't been able to make that work consistently, but still, it sounds great.