I don't like replying to questions asking to sort sound on an openSUSE-10.3 live CD. The reason being 10.3 comes with alsa-1.0.14, and often new hardware needs alsa 1.0.15 or 1.0.16. Or a custom edit is needed (for 1.0.14) to the /etc/modprobe.d/sound file.
This is all mostly doable under a live CD, but its a lot of work, and as soon as the power is turned off, the work is lost. For example, if a new version of alsa is loaded, then one needs to unload the old alsa, and reload the new alsa, which is painful and fraught with hiccups. Its far easier to simply reboot, but in the case of a Live CD, that is not an option because the alsa update is lost upon the reboot.
But if you wish to persist, you can try working your way through the audio troubleshooting guide:
http://en.opensuse.org/SDB:AudioTroubleshooting
... however that guide is NOT designed for live CDs.