Glad you like so much about this arranger so far...
Seems like it offers a lot for the money..

Did you try setting it up as a master keyboard?
Does it support midi over USB so i can plug it into my PC and controll some VSTīs
Can i assign different midi channels to the splits on the BK9?
Can i split the keyboard up in 3 or even more parts?
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Yamaha Genos, Roland Jupiter 80, Ipad pro.

http://keyszone.boards.net