I recently got a Roland E-A7 "Arranger" keyboard which, unlike my previous keyboard, uses a "USB-to-Host" method to connect to my computer for midi communications (my former kbd used the standard midi din plugs, btw).
Thing is, for some reason when I now try play the BBox midi style demo songs outputted to that keyboard, I'm only hearing some of its tracks via the keyboard and not for instance the Melody nor Soloist tracks. Or rather, I do sometimes hear them when muting all the others but very weakly, even after amping up the velocity levels & volume of those tracks.

Any thoughts or suggestions?
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Never finish what you can't start!
BBox 2021 Audiophile, Mac Pro Intel, OSX 10.6.8, 800x600 (TV VGA)