I have managed to skirt around this issue, but it is getting in the way of midi testing.
Most MIDI devices and MIDI program interfaces (such as Rosegarden and Timidity) appear under the ALSA connections in jack. However, the default MIDI utilities appear under MIDI and not ALSA and are not available to patch to the ALSA midi ports.
Gmidimonitor with jack support should be an ideal way of testing the output of pad and keyboard devices, but it appears under MIDI connexions and cannot be connected to the ALSA connexions midi ports. With the 'Gmidimonitor with ALSA support' version, it does not appear under any of the jack connexions headings.
Do the programs have to be rewritten to use ALSA MIDI ports? I know they are open-source, but that would be a bit beyond me!
I am hoping there are config files available to change the ports over.