I'm testing this on M3B4 but I've seen the same thing
on Mageia 2.
I'm researching Mageia for a friend for a midi sequencer.
Rosegarden is one of the more popular Linux sequencers and
is in the Mageia Repo. It's a long but simple install with
only one selection then a whole bunch of files being installed.
The Rosegarden icon then appears in the Sound & Video launcher
and opens quite nicely but also displays a window indicating
that the Jack server needs to be running. The MCC Software
Management tool tells me that jackit is installed by default.
But try as I may I can't make Rosegarden make any kind of sound.
Any and all suggestions are appreciated.