Asus Xonar DGX recognized but no sound

Just ran into the same problem

After fiddling around I started alsamixer, selected the sound card (F6), and changed Analog Output to Multichannel.

1. Install alsa-utils In terminal type:

   sudo apt-get install alsa-utils
   

2. Run alsamixer in terminal

3. Hit the F6 key.

4. Arrow over to "Analog Output" and arrow up/down to change to "Multichannel"