Issue seems to be solved. I added karmic-proposed to software sources
and updated the system. Don't know which of the updated packets solved
it ... maybe the kernel update to 2.6.31-18-generic.
I can now choose the USB sound card in alsamixer and with
System->Preferences->Sound and the speaker set (Teufel Concept B200 USB)
is working flawlessly.
** Changed in: alsa-driver (Ubuntu)
Status: New => Fix Released
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C-Media USB Headphone (USB sound card) doesn't work
https://bugs.launchpad.net/bugs/508112
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