Originally Posted by uman

Are you planning to use VoodooHDA, or AppleHDA? If Voodoo, first rename all references to HDEF to ALC6 (or whatever turns you on ) Doing so will prevent AppleHDA from loading and matching your HDA device. If AppleHDA is loaded, then VoodooHDA doesn't load.

Next, and this is common for both Apple and Voodoo. Add this to your HDEF or ALC6 device:
You can then add your pin configs in there or in the plist depending on how you want to get sound going. See the great guide on infinitemac, or the one on projectosx.

Search my posts and look for my question on pinconfigs to find the links. I'm still trying to find out how to get my pinconfigs without Windows, since I don't run that anymore!