This was Bug 2968887 and was fixed around FC11 time.
Rosegarden works with timidity under FC13, but is broken in FC14.
I used to be able to say:
timidity -iA &
and all the rosegarden contemporaneous MIDI/audio would work.
However, now, under FC14, I get no audio out, except that sometimes there is a blast of v. quick audio after exiting rosegarden.
This is totally repeatable.
Any ideas? Ta.