I got it to work. I put -x winme at the beginning of the Jack Port Audio
shortcut properties (instead of the end), and in both the prefix and suffix
areas in the control panel. Not sure which did it, but after a restart, the
mpc showed up as "system midi." Then all worked as expected. Weird. Sorry
for the head cramps. Thanks for trying to help.
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http://jack-audio.10948.n7.nabble.com/Jackit-f3.html