Thing that strikes me about this is, with only clocking together, you might be able to create a Yamaha/Roland hybrid by running the BK from the PSR. Just send the NTA channel from the PSR to the BK (I think you can mute its reception of other MIDI channels in the MIDI set).

That way, you can mix and match styles together, and have certain Parts from one style play one unit, certain on the other. You'd have to tap dance a BIT to get them to do fills and Variation changes at the same time, but sometimes, that might not be what you want! Think of it as maybe an external Multipad on steroids!

Life would be SO MUCH simpler if there were a standardized set of codes for MIDI arranger operation. Basically, if ONLY Fills, Variations, Breaks and On Bass were standardized (start/stop already are) that would be enough to run most setups (a standard code for transpose value would be nice, too). I talked to Steve Demming about it, but he said that very little interest had been shown in that, and until users start clamoring for it, it's unlikely the manufacturers would be willing to sit down with each other.

But with the BK, and Audya modules out now, and who knows, maybe a few others following (if the BK takes off), more arranger users will start to see the importance of this.

Quite honestly, if you COULD link together two or three MOTL arranger units, I believe you would end up with something that sounds MUCH better than any one TOTL piece of gear. The strengths of each line would mitigate the weaknesses of the others...

But, you want this vision to come true, you have to ask for the features that will make it possible.

And, I imagine, as in ALL new arrangers, that the styles in the BK will be a combination of some new, some rehashed and reworked, and some from other, older arrangers (E80, G70, etc.). As it always is...