vista with double soundcards

I would like to be able to listen to music in my computor room (through
analog) and digital via my surround-system in my livingroom.
My computor is build on a ABit AB9 pro motherboard with an integrated
soundcard.
Unfortunately the analog port is broken but the digital works.
So I bought a new Creative SoundBlaster X-Fi Xtreme Audio.

The problem in Vista is that I cant choose to have 2 default soundcards.
Or using both ports on the new soundcard.

If i could send all sounds digital from the old soundcard and analog from
the new one my problems would be solved.

OR.. If I could get both analog and digital sounds att the same time from
the new Creative card...
Do anyone know if this is possible??
and how to do it?