Jack midi output

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I would like to connect a track to the bristol synthesizer, that accepts midi input from jack. When I set lmms engine to Jack I still can't find a way to have a track midi output sent to jack.

The closest I have got to what I want is to click the tools button of the track, then MIDI > Output > 128:0 Client-128:qjackctl, but then the midi output appears in qjackctl as an ALSA midi output and I can't connect it to bristol (or any other jack-enabled synthesizer that I have), that appears in the MIDI tab.

Can somebody help?
A2jmidid might help: http://home.gna.org/a2jmidid/