I solved my sound issue in Vista. I had no sound at all with everything configured correctly in Debut. Then I read on another web site that some sound devices are disabled by default within Vista. Here's what I did:
1 - right click on the speaker icon in the tray
2 - select recording devices from the popup window
3 - right click in the middle window of the Recording tab
4 - select 'Show disabled devices'
5 - select 'Stereo Mix' from the list
6 - click the Properties button
7 - From the General tab of the Stereo Mix window, set Device Usage to 'Use this device...'
I'll be darned, it worked perfectly!!!
Hope this helps