The Audigy 2 should be suitable, but will not show up as separate devices, which is what Cool Edit needs for multi-channel outputs. Most audio programs do not offer the capability of splitting signals to various channels on a single soundcard. You would need a proper multi-device sound card such as a M-Audio Delta 1010LT or similar, or 2 cards. I don't think it is possible to get 2 Audigy cards to work in one computer.
It would take me about an hour or 2 to throw a simple program together that will play a couple of audio files and split the signal using an open source DirectShow matrix filter to send signals to the various outputs on the Audigy.
I'd be happy do do this for a bit of fun as long as you can wait a few days until I can find some spare time. Email me if you are interested
miwa (at) csas (dot) net (dot) au