Rody via tde-users wrote:
If installing pulse could solve this problem, I could try that. The fact is that the linux mint systems that work without problems with this rubix usb box also use pulse.
Install pulseaudio and pavucontrol and report back.
KMix is reading the system devices (AFAIK), so it must be something down the system path that is preventing kmix to list the device It could be also that a patch is needed in kmix for some reason, but we do not have any details.