Originally Posted By: Elefem
I'm wondering if I should be setting all ports to the Uno
Of course you should if your intention is to hear the notes via your Uno. And ignore the lights if your ears and eyes don't match each other. Rely on ears before eyes in music, always,
Also, your optimal chain of sequence is: 1. start up Mac, 2. turn on keyboard and 3. then run BBox!
Originally Posted By: Elefem
Perhaps I'm mistaken in expecting to hear the BBox rhythm section over my keyboard phones under any circumstances?
No, as long as those are midi, that is precisely what you should expect. It works on my keyboard and I'm on a Mac like you => it should on yours as well.

There's only one thing to do in crisis like this - Sleep on it!
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BBox 2022 Audiophile, Mac Pro Intel, OSX 10.6.8, 800x600 (TV VGA)