have you tried this website yethttp://wiki.debian.org/ALSA
you can try 'alsactl init' as root and then reboot the computer to see if sound works. so your code would look something like this
"sudo alsactl init"
you may need to instal alsa-utils
That kind of the generic way to do it on debian as i understand. But if that doesnt work that page has other various methods of setting up sound