I had Lion working well with audio (ALC883 on a P5N-E SLI) and I decided to get the Mountain Lion DP4 running (Yes, I am an OS X Developer), so I build the latest Chameleon from trunk so that I have support for booting Mountain Lion, replace the boot file and install Mountain Lion. Everything works fine after installation except for audio. After a few hours of trying different things I decide to give up and go back to Lion. To my horror Lion now doesn't have sound, nothing changed beside the Chameleon build. I'm using VoodooHDA, but I've also tried various drivers with no success. Lion is being run in 64-bit kernel mode.