I finally got sound working on my GA-EP45T-USB3P!
Verified working on 10.6.5!
Be sure to use KextUtility or something similar to install the kexts with.
Note: I'm using Cartri's MacBIOS firmware, but this should work for all EP45T-USB3P boards.

1. Download Gigabyte_ALC889_P55.zip: http://www.mediafire.com/download.php?z01fznwnumn
2. Download ALC-UniFix for 10.6.4+: http://cartri.net/downloads/ALC-UniFix.pkg
3. Unzip Gigabyte_ALC889_P55.zip
4. Install "HDAEnabler_for_Snow/HDAEnabler.kext" to /System/Library/Extensions/ and
Install "ALC889_LayoutID_12/4outs2ins HDA headphone/LegacyHDA.kext" to /Extra/Extensions/
Note: Pick the 4outs layout in "ALC889_LayoutID_12" that matches your front panel (HDA or AC'97/regular).
5. Install ALC-UniFix
6. Repair permissions with Disk Utility
7. Reboot!


You can then make an aggregate sound device in Audio/MIDI Setup if you want 5.1. Play your DVDs in VLC and enjoy the surround sound.

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