At some point we added an option to Rosegarden to stop it from launching
JACK. Go to Edit > Preferences... > Audio > General tab > Start JACK
Automatically. If you uncheck this, JACK will not be started by
Rosegarden. This bug can likely be closed.
** Changed in: rosegarden (Ubuntu)
Note: you can use timidity with jack, but latency is terrible compared
to plain alsa.
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Rosegarden Starts Jack Automatically Preventing Alsa Playback
https://bugs.launchpad.net/bugs/620044
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