Mine is the opp to yours. I have a SB Live sound card and on board. With FF my
oe board will play the sound and the rest on the SB. Have you tried this? Go to
the speaker icon and double click. Go to file and see if your sound card is on
default. Next go to Edit and then Preferences. Check to see if all tracks are
mark visable. Check your volume control levels next. You can al so check
System>Prefernces> Sound and see if you sound is detected there too. I kind of
bugs me cause my sound card use to run all sound. Ugg.

The only spare sound card I have is an SB 64 that'll only fit in an ISA
port (which I don't have - just a few PCI's and an AGP). And yeah, my
sound card is detected in both the volume control and sound
preferences. And the only settings that are muted or set at minimum in
volume control are 3D control and recording devices (since I have none)

Your might try checking these settings. In terminal run alsamixer.
You also might check out this how to it helped me back in breezy

http://www.ubuntuforums.org/showthread.php?t=32063

Other than that all I can say is good luck, I hate sound problems
because there are so many settings in so many programs.

I installed Dapper Drake on a new laptop (vista is still in its wrapper).

It does mostly what I want, but I can't figure out how sound works.
The laptop controls say that the sound is muted, but I still hear sound.

Some applications seem to have independent control over the built-in
speakers. When I play DVDs the sound is too soft. When I play games
the sound is too loud.

Is there a system tool that can override the individual programs'
control over my speakers?

What is the make and model.

https://wiki.ubuntu.com/Home?action=fullsearch&context=180&value=laptop&titlesea\
rch=Titles

Great Quality
Model:
NX-L510
It is not on the compatibility list