Like I said, I've tried all the sound options available to me, including the "DirectSound" and WaveOut options, but to no avail. The MCE version may indeed have some special stuff going on, because WinTV2000, the Hauppauge PVR program will not even load. But ChristTV and MediaCenter 11 will recognize the card and except for MC11, produces good results (sound & video). I wonder why ChrisTV sound is OK but not on MC11. I do know that MCE 2005 is awefully fussy about having things just so, so maybe there's a problem there.
As for the Channel ID's being stored in the registry, I had assumed they were stored in a file somewhere. I had them before the reformat and figuered they would have to be a file somewhere. Never would I have guessed you would store that sort of data in the registry. Oh well, I can't restore the registry, but maybe I can get that key out of the old backup file.
I sure do wish the sound was working though. Thanks.