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Both Qsynth < 0.2.6 and FluidSynth < 1.0.8 are infected with a very nasty memory misalignment bug that causes random crashes at qsynth/fluidsynth engine restart, specially if you set qsynth's output levels meters on. It's been by sheer luck that the bug does not crash qsynth all the time--in fact, the bug has been lurking in fluidsynth < 1.0.8, for quite some time.

This has nothing to do with jack, whatsoever. It's in the qsynth/fluidsynth interface pair, that's for sure ;)

The recommendation goes for an overhaul upgrade on Qsynth 0.3.2 and FluidSynth 1.0.8. Make no compromises.

Cheers,
--
rncbc aka Rui Nuno Capela