If you have an iPad, it might be interesting to use the BK Performance Editor to ‘capture’ the sysex strings used in selecting MFX/EQ and adjusting their settings…

Not sure how you’d do this, the iPad wants to be connected via USB to the BK9, perhaps it could USB to the computer and set ‘through’ to continue to the BK9, or maybe simply select MFX while in record mode in the 16 Track Sequencer.

But if you can get it to work, it might give you a way to deal with the editing sysex…
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An arranger is just a tool. What matters is what you build with it..!