VoodooHDA is a simple kext that enables audio on hackintoshes. I tested it on OS X 10.9 Mavericks and 10.8 Mountain Lion (with iATKOS ML / ML2) and it just works. Of course it depends on your audio card, but as far as I know, it works on almost every card.
The problem is that VoodooHDA kext sometimes gives kernel panic. They seems to be totally random and sometimes disappear on reboot, sometimes not.
However, here’s the fix: VoodooHDA kext with kernel panic issue fix!
Just extract the kext file, place it in /System/Library/Extensions and rebuild the cache with Kext Utility. Reboot, and you should have audio working.
If you still have issues, delete AppleHDA kext from /System/Library/Extensions (and rebuild the cache again).