Check the MIDI settings…
But honestly, if I were you I would put the MIDI files on a stick and play them from the BK9. The reason for this is it would easily allow you to use the Makeup Tools to edit the files, which opens up a world of improvement, using the best sounds and kits, adding FX or EQ to Parts, and one of my favorite tricks, putting Markers into the file so it’s a snap to add extra solo sections (nice to have short and long versions depending on the crowd, or someone sitting in!).
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An arranger is just a tool. What matters is what you build with it..!