i tried your suggestion HackBook Pro .. but still no dice ... I tried original AppleHDA.kext alongside ALC889HDA.kext and patched AppleHDA.kext with ALC889HDA.kext
i'm still having crackle noise ... i also changed audio midi setup from 44.1khz to 96khz
will appreciate any other suggestion
I started off trying the instructions from this post, so I added an HDEF to my DSDT. Maybe you need to do that?
I used to use VoodooHDA for my sound, that might work for you.
I don't really know much about this, I just found something that worked, then stopped touching it