Well AppleHDA is the stock driver and doesn't not simply work with any codec by default.

The one I had attached is a modified / patched one for use with ALC861VD Codec, but it doesn't even load just by itself - to use it you'll need a device inject as well, this can be the HDAEnabler.kext I mentioned, or an EFI String or DSDT modification.

Apart from that it might help if you could boot some kind of linux distribution like Knoppix or anything like that, and dump your audio codec into a textfile.
It's usually located in place similiar to /proc/asound/card0/codec#0 (numbers might be different) To create a codec dump, you can use "cat /proc/asound/card0/codec#0 > /location/codecdump.txt" on the command line - if you could provide such a file it would be much easier to help you to make your sound working.

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