Hi.
I have just got a BK7-m to have fun and play all Roland styles from the period I had G-70.
Would like to add a BK9, but got this at a great deal.
Got it successfully connected to the Korg MA without any problems.
I've "silenced" Korg by use of the volumesliders just to use it as keyboard to play BK7 "as is", but I have also used Korg sounds in right hand along with BKM styles..
Connection wizard works well, and I did use the "Master keyboard" option. Piano and piano other brands works OK too.
One touch feature works well, split at Ab#3, and bass inv off.
Pitch bend wheel/vibrato joystick works ok when do this early tests.
I'm planning to use Akai MPK 61 and then I probably have to do more "complex" manual midisetup to transfer/trigger most commands at BK7 from that keyboard.
But that's another long shot .....

Btw.
BK had firmware 1.05, and I downloaded 1.06 and 1.07 and updated successfully in case this would fix any bugs.