it seems you got working?

for sound, you should know the your soundcard chipset such as realtek ALC889.

for ALC889a, ls8v12 should have AppleHDA.kext and hdaEnabler.

for LS8v14 kext and just another example, look at this link

http://forum.insanelymac.com/index.php?showtopic=132211

for further information , use your mainboard name , chipset as search