Hi, I have a similar issue with my new board. I couldn't get any of Taruga's stuff to work with it, but VoodooHDA at least gives me stereo audio...through all of the audio out ports (basically, I have 4 sets of stereo output). Headphone port also works, but has to be set manually. Mic/Line in ports don't work (line in isn't even detected) and S/PDIF output (coax or optical) don't work either (and even have some insane output options, like 32-bit 192khz audio).
Audio MIDI lists 2 Mic ins and a S/PDIF in, and Unknown (which is rear audio), Headphones, and S/PDIF output. The board is a Gigabyte EP43-DS3L, which I understand is very, very similar to the EP45-DS3L (only difference being the number of PCI-e channels from the chipset and a second x16 slot). Running Mac OS X 10.5.8 Vanilla with chameleon bootloader.