[linux-audio-user] unable to use qsynth

I am trying to use qsynth to play midi files through jack. I have tried 3 different sound fonts. 2 make no sounds and the GM font just crashes with output 'Killed'. fluidsynth does the same when using that font. When I play the midi with pmidi -p 129:0 file.mid I see green lights flash and such, but no sound comes out. I turned up gain but nothing happens. Using Qjackctl I see that the connections are right, it should be making noise. Pmidi seems to be ok with it... But nothing comes out. I have tried 3 different fonts and 2 different files having totally different content (one heavy metal the other piano music). I don't know what to try next. Thanks for any help.