Yes pavucontrol is istalled and working.
Anyway, now is working but i really don't know why! :O
I think i noticed the problem: in Phonon settings menu (in kde->multimedia settings), in the second tab "hardware configuration" i cannot choose anything from any options, they're just blank...as there was no sound card installed....(and actually "alsaconfig" returned no audio devices when launched from the terminal...any connection?).
Basically I opened this tab trying to select something (but there was nothing selectable actually) and...out of the thin air...my music player (which was playing music in the background just to test audio) started to talk
Any suggestion on what could have happened?
Thanks a lot