if you are trying to route the digital output of your Hollywood Plus card through your sound card, it cannot be done. The best that can be done is passing the 4-channel analog downmix, and this only works with some sound cards (and requires dvdgenie).
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If you have a SBLive5.1 card, visit this page Link Removed
It has a registry hack so that you can route the digital datastream to the Live, install it. Then click AC-3 Decode in the Surround Mixer under the Advanced options, and you have a 5.1 analog signal coming from the Live!
SBLive platinums do, many M Audio cards do too. I think that maybe the Hercules Game Theatre does (Have to look that one up tho). [Edited last by Richard Cooper on November 13, 2001 at 05:46 PM]