I'm one of the few Roland supporters here but I'm very satisfied with my BK9 . Some can't get the operating system but I don't think its that complicated. Global is what it says, settings there efffect everything. Preformances are individual Styles. You can make one for each song or as I do use general settings so I can use a Style for a few songs. Saving settings is where it can get tricky and I won't try to explain that here. Better you use the manuel and fool around with it a bit.
I also want to contol my Preformances from my IPAd with UnRealbook and started a conversation on the Roland Forum. I collected the info offered but haven't really tried all of it out yet. Keep us informed of your progress with that.
Good luck with the BK9, its a great board for the working musician.