I have a Dell 8100, SB Live Value sound card, and Creative 12x DVD drive with Creative DXR3 card, Labtec powered (non-digital) speakers, Yamahe CD drive, and Windows ME.
The sound card gives 4 point sound output from a CD in either drive, also from any form of sound file on the hard drive. A DVD in the 12x drive gives sound only from the front speakers. No wiring option affects this as the signal gets to the DXR3 from the 12x drive through the ribbon cable and can only get to the sound card from the DXR3 out to the Live in or aux. A CD gives 4 point sound whether it is wired directly to the Live card or via the DXR3.
I am using the latest drivers, downloaded from Creative, for both cards, and combed the FAQ's and helpfiles of both Creative and Dell prior to the six months, so far, of unproductive communication with them both. Thanks to Dog* for the suggestions - regrettably all tried long ago.
The Matrix from only two speakers is not the same.