[LAD] jack session support, yoshimi

[cal]

I've got yoshimi jack session support behaving semi-sensibly with pyjacksm and
jsweeper, but there's one point I'm struggling with. Jack midi connections aren't
being stored by session save -
<?xml version="1.0" ?>
<jacksession>
         <jackclient cmdline="yoshimi -d ${SESSION_DIR} -u 4" infra="False" jackname="yoshimi-yoshimi" uuid="4">
                 <port name="yoshimi-yoshimi:Left" shortname="Left">
                         <conn dst="system:playback_1"/>
                 </port>
                 <port name="yoshimi-yoshimi:Right" shortname="Right">
                         <conn dst="system:playback_2"/>
                 </port>
                 <port name="yoshimi-yoshimi:In" shortname="In"/>
         </jackclient>
</jacksession>

I figure it has to be some deficiency in my port registration, but that seems
straightforward enough -
     midi.port = jack_port_register(jackClient, port_name, JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0);

I'm not asking for in depth debugging/analysis support here (I'll figure it out
eventually!) but I'm hopeful someone might have an 'off the top of the head'
suggestion.

cheers, Cal