Hi,
I have a sound system from Teufel (Concept C 200) which has a built in
USB sound card and an analogue aux input. When I connect the USB cable
to my computer and the aux cable to my radio, then the sound of the
radio does not play. When I unplug the USB cable the sound from the
radio starts playing immediately. I have found out from the hardware
manual that the sound card is able to control the aux output and mute it
or control the volume. On windows it is possible to simultaneously
enable both usb and aux inputs (see [1]). I have not found any way to do
the same in Ubuntu so far and I would like to know if this is a bug (or
missing feature) in which case I would report it on launchpad, or if I
simply haven't found the right option.
I have already tried to use alsamixer and pavucontrol. In alsamixer i
can see that the usb sound card has separate "speaker" and "line"
devices, but changing the volume does not affect the output. In
pavucontrol there is simply no way to see the difference between
"speaker" and "line" as there is only a single volume control for the
usb sound card.
Regards
Sebastian
[1] imageshack.us/photo/my-images/716/soundlevels.png
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