Wow. You should search the forums for KX PROJECT.
There is a lot of discussion ot he KXPRoject drivers for Creative audio hardware ont hese forums....
I've been looking for a way to reencode audio in realtime to 5.1 in linux lately, while I haven't found that, i did find a way to do it in windows for anyone interested.
http://kxproject.lugosoft.com/index.php?skip=1
thats a driver for audigy, and compatible sound cards that will reencode and send 5.1 out spdif.
There's also one that works for nearly all soundcards called DolbyOutDS
It's prety hard to find an active download but I archived some versions here:
http://gooki.orcon.net.nz/car_audio/DolbyOutDS/
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