Terratec Aureon Dual USB soundcard in Debian Linux

apt-get install alsa-base
apt-get install pulseaudio
apt-get install pulseaudio-module-blueooth
apt-get install pulseaudio-utils (this might be installed automatically)
alsa force-reload
reboot 


Edit /etc/modprobe.d/alsa-base.conf and make the following modification:
Comment out the line preventing USB audio to be listed first, like this:

    # Keep snd-usb-audio from beeing loaded as first soundcard
    #options snd-usb-audio index=-2

Replace with the following line:

    # Allow snd-usb-audio to be loaded as first soundcard
    options snd-usb-audio index=0
    

If it for some reason stops working at a later date, purge the alsa-base and pulseaudio packages and try again.
apt-get remove --purge alsa-base
apt-get remove --purge pulseaudio


Some useful commands:
pactl list short
pactl load-module 
pactl unload-module