I previously posted about my Asus Xonar DX in Ubuntu. I have found a better fix after my reinstall.
The problem I was having was when I adjusted the volume it stopped/stuttered for a few seconds.
The solution: here.
I enabled the backports repository and installed
GUI way:
System>Administration>Software Sources>Updates>tick Unsupported updates
System>Administration>Synaptic Package Manager>click Reload then search for inux-backports-modules-alsa-karmic-generic
and install and reboot. Done.
Terminal way:
Uncomment backports lines in /etc/apt/sources.list (sudo nano /etc/apt/sources.list)
sudo apt-get update
sudo apt-get install inux-backports-modules-alsa-karmic-generic