I did go to the Creative site and didn't have much luck - your ferreting-out skills are better than mine obviously. Thanks for the info.
This beta TBSC driver has had mostly positive feedback in other forums. One known issue is 5.1 playback while watching DVDs is broken but, as I only run 2+sub, this doesn't affect my usage. And they *did* fix the problem I was having with my game. I'm curious to reinstall other games I had sound problems with to see if those work now.