Having lost the Hollywood + software and drivers for my old DVD PCI card, from a purchase in 1998, I downloaded the updates from sigmadesigns website yesterday and found several upgrades to it, with surround sound suitability. etc.
Have a look unless you have checked already.
Running the latest drivers on both the H+ and Audigy, but thats don't help.
A while ago I did link the spdif from the H+ to the spdif in on the header on the Audigy, but could not get anything out of that when supplying AC3. If set to supply PCM then I think I got 4ch which ain't quite right.
I am sure at least one person has solved this, as I found some details on a forum *somewhere*, but the email bounced