Under the MIDI tab in the Connections window, MIDI-capable programs (like ZynAddSubFX, seq24, vkeybd, etc.) should appear. But both the "Readable" and "Writable" panes in the MIDI tab are blank. MIDI instruments do appear on the ALSA tab, and they can be connected there.
Binary package hint: qjackctl
Using Ubuntu 8.04.1, qjackctl 0.3.2-1ubuntu1
Under the MIDI tab in the Connections window, MIDI-capable programs (like ZynAddSubFX, seq24, vkeybd, etc.) should appear. But both the "Readable" and "Writable" panes in the MIDI tab are blank. MIDI instruments do appear on the ALSA tab, and they can be connected there.