Someone special got me an upgraded Zero DAC for Christmas (Weee!!) I have it plugged in and working with a coaxial cable and it's just amazing, what a profound difference. 
I have found out though that games with Alchemy enabled to not pass audio to the digital output. The same goes for the various settings within the Prelude control panel (gaming, entertainment, etc..) In the past I've used 5.1 sound and mixed it to CMSS-3D Headphone, and that seems not be possible now. Does using the SPDIF out of the Auzen Prelude completely bypass control panel functions (CMSS, EQ, etc.)? I'm using Vista 64.
I have found out though that games with Alchemy enabled to not pass audio to the digital output. The same goes for the various settings within the Prelude control panel (gaming, entertainment, etc..) In the past I've used 5.1 sound and mixed it to CMSS-3D Headphone, and that seems not be possible now. Does using the SPDIF out of the Auzen Prelude completely bypass control panel functions (CMSS, EQ, etc.)? I'm using Vista 64.