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have you tried with any soundfont file and does it crash all the time?

backup qsynth configuration file (~/.config/rncbc.org/Qsynth.conf), put it away and start from a brand new one. qsynth defaults to jack on the audio driver and alsa_seq for the midi one. also, 44100 is the default sample-rate, so that you'll have to make sure jackd does start on that precise rate, otherwise you'll have to match it under qsynth/fluidsynth's engine (cf. Setup/Audio/Sample Rate).

please, test with several soundfonts and report which ones are at stake. if the crash problem happens on all situations then that's probably an issue with your distro supplied packages (qt4, fluidsynth, and whatever else) aren't well suited to each other, perhaps... :/

cheers