Diki,

You are spot on as regards the re-instatement of the Dynamic Arranger in the BK9 update. Like Fran says, I would almost consider getting one if it weren't for the terrible OS, or rather the non touch screens. Totally dated, as with most yamahas by the way,but many Yamaha players have moved from one model to the next and therefor hardly know any better
But yes this Dynamic Arranger ( even the possibility to give it negative values ) is utterly rewarding and creative.

regards,
John