Thanks for the commands sequence.
Regrettably, nothing has changed.
I play a tune on Amarok, than a video off Youtube, then back to Amarok and it just hangs.
No Output devices but PA either.
This is as far as i can go for now, i guess.
Have seen some tips and tricks on a rather large thread at kde.org. None seemed too convincing.
Myriam Schweingruber, one of the main Amarok figures, told that it looks like a "system" issue (system meaning distro).