You could try the alsa sound drivers...
ALSA=Advanced Linux Sound Architecture
Its the next generation of Linux sound drivers and are the default in kernel 2.6 (e.g blag20k & fedora core 2).
alsaconf appears not to be installed. I couldn't find an option to install the alsa suite under the 'system settings/install apps' menu. I started to read the alsa project pages but quickly got out of my depth.
Note, alsa sets its channels to mute by default. You can change levels with (also in the menu):
I tried to install the gnome-alsamixer using the 'install apps' menu, but it just comes up with 'there was an error' popup, whether I do is as a user or root.