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