Hello Rusty!
Hydrogen has a QT GUI. So if you can compile it with QT4 or later, then it
might be accessible. You are running a relatively recent system, so Orca
should have support for the QT accessibility stuff.
But Hydrogen also has a commandline mode. Mind you in that mode it just
loads a prepared kit with or without a prepared song. I use that mode, since
I have a very nice kit and I play live. But if you really want to program your
own drumkit and rather use pattern based recording, you should give it a try.
Warm regards
Julien
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http://juliencoder.de/nama/music.html