fyi : the
upcoming 0.9.6 release of hydrogen adds jack MIDI
and also full jack session
support ;)
There you go. So, to the OP, it might be a good idea to use Jack MIDI
instead of ALSA. It's easier to learn and use, more portable (FWIW...), and
easier to connect to other Jack apps.
For connecting apps that still use "legacy" ALSA MIDI (like pre-0.9.6
hydrogen in this case), there's always a2jmidid (
http://home.gna.org/a2jmidid/)
-- Dan