I've got some trouble getting my audio out to work.
I'm running ML 10.8.2 with custom DSDT and AppleHDA.kext. Audio input seems to work, at least I get some movement in System Preferences Audio input. Everything regarding audio out shows up, I've got a device in Device Manager, OSD when I push my fn keys to toggle sound. My Notebook recognizes, if I plug in headphones and switches the output device to headphones. Still got some errors though (see attached screenshot "dmesg").
So I dont think, there's much left to be done to get audio out working, but I dont know where to look...
If you need any more information, let me know :-)