I remember discussion of giving an option to jackd (was it "-X"?) in order to
get it to show all the ALSA MIDI stuff in JACK MIDI. I've tried it on jackd 0.116 and
neither "-X" nor "-x" are recognized options.
Then there's also this separate thing "a2jmidid", which seems to work well,
but I'm not sure if I need it if I can find this elusive jackd option.
-ken