It seems there are 2problems.
"Intall pavucontrol" : OK
"Launch puse audio volume control" : answer on click in the Launch menu "connection failed : connection denied"
in a console : launch pulseaudio give answer "launch of the demon failed, no module loaded".
In a console (root), i have launch pulse-enable. A message have asked to reboot.
On lsmod, no pulse at screen.
Module snd_usb_audio has 0 user.
At this moment, kmix is installed but can't be uninstalled wihout uninstall package "kde-multimedia (dragon Player, Juke, Kscd, Audiocd).