Your Tritton headset should not require any drivers.
The DAC is fully independent and only needs to be connected to the TOSLINK output.
Also, the microphone is a clip-on analogue type.
No special drivers at all are needed for either.
What I would recommend is to connect your headphones directly to the 51 analogue outputs using the G9-PC Adaptor.
Connect the microphone to the proper input using the Microphone Extension Cable.
As your onboard sound undoubtedly has a higher quality DAC, this should give you the best possible sound quality from your setup.
It will also give you full 5.1 surround while gaming (onboard audio is not capable of encoding game audio past stereo while outputting to TOSLINK).