Things might be different with pulseaudio, but that
thing never worked
for me, probably the bad carma of it's creator still sticks on it.
Nik
My experience with pulseaudio is the same; I have learned to forbid
its installation, and I stick with ALSA.
BTW, when I right-click on the KMix applet and choose Select Master
Channel, I just get a radio-button list, no way to choose an underlying
device. (?)
Interesting. In your screenshot the dropdownlist with the selectable
soundcards is missing. Here's what I get on my system.
Nik