You want 2 channels at 96Khz sample rate and 16-bit quality (max supported by the DG). Enable Dolby Headphone if you like. Roccat's site says the impedance is 10 Ohms but there's no option for that in my Audio Centre though your's may be different. Enable virtual surround too if you wish.
Asus software is atrocious btw
ive read online that people talk about enabling dolby headphone, but i cant seem to find that

but ty allready for helping me with this.