I’ve found that using the ALSA sound system in Ubuntu is pretty slick, but becomes a pain when the sound tool in Ubuntu doesn’t correctly switch devices using the graphical user interface.
In a nutshell, here are a few useful commands to list and select the sound devices that are on your computer:
list available sound cards
<code>asoundconf set-default-card !!#</code>
Set the default sound card. Replace !! with the device name from the previous command
Adjust volume settings for your specific sound card. Once again, replace !! with the device.
Running through these 3 commands will probably save any user a great deal of grief in the long run.