No probs Blackdevin sorry I couldn't be of more help but I think truly the grief just isn't worth it and you will get a much better quality of sound anyway.
I am using a Logitec Z 506 system with my main machine and mate it can blast the neighbours off the hill it isn't expensive either and I have rigged as 5:1 plus there is a headphones socket on the main control speaker.
The Xonar is actually capable of driving 7:1 systems by the by