I personally added myself to those two pulse groups but if your onbaord worked it means you don't.

I need to think on this and look at how ubuntu handles some configuration files but what strange is that the Xonar driver is loaded but aplay -l doesn't show it.* hopefully someone better versed in the ways of *buntu will see this but I'll carry on thinking on how to solve the problem.

*mine with a D2 gives
**** List of PLAYBACK Hardware Devices ****
card 0: AV200 [Asus AV200], device 0: Analog [Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: AV200 [Asus AV200], device 1: Digital [Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0