Just wanted to share my experience. I'm on a 1.1 f10 board. I had this running fine on 10.5 and decided to upgrade to 10.6. Went fine except no audio. I've been pulling my hair out for the last couple of days with no success on the audio.

Here's my tip, don't run PFIX from the finder. Run it from Terminal with sudo. I kept running it from finder and was getting feedback but it turns out it was failing to actually do anything.

Works like a charm now! Thanks for everyone's hard work!