I have never tried something like this, but I do recall seeing some things in certain programs were you specified what device it used to playback audio. Honestly, I feel this whole idea is a waste or time and resources as a single soundcard would work just fine...
__________________
Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
|