open a shell
modconf
answer the questions like you did when you first installed debian
select kernal/sound/pci/emu10k
then snd-emu10k1
select kernal/sound/acore/oss
then snd-pcm-oss
then you need a sound mixer to set the levels
apt -get -f install aumix
once aumix is installed
run aumix from the shell and set the levels
apt -get -f install xmms
this is a mp3 / cdplayer etc you can now test your sound output