I really enjoyed the Ketron Midjay for a couple of years. There are some trade-offs in using a module--more wires to hook up, more pieces, etc., but you gain a lot too. Like very light weight and portability and the option to use any controller you like.
I even used a Casio WK a couple of times.
I wish the BK had a vocal input and harmonizer. Still, if it sounds like an E80, or even marginally better than my E50, I'm in.
DonM

For some weird reason, Roland don't seem to dig footpedal controlled pitch. Have no idea why. On an arranger, without a chord sequencer, pitch bend levers are almost useless. I've always wondered why the old Mk2 ARP Odyssey idea of two BUTTONS isn't used. I have to say, using a pedal only allows you to bend in one direction, which is a compromise.. A couple of foot switches, giving a bend at a preset speed (programmable for the UPG, say) would do the job quite well.

Especially for accordion players, who have both hands busy just like arranger players, this might be a boon.

To be honest, for an arranger player that already HAS an arranger, and only wants to play arranger, I'm not sure this is the solution. As Don says, more wires, more hooking up, more things to carry, the list is quite big.

But for someone that loves some of the new WS's, but needs true arranger capability TOO, this looks like the tool for the job! And for someone willing to try to run two different arrangers at the same time to expand their sound and style diversity, again, the perfect product. For one guy with one arranger? Not so sure. I think I'd rather have an E60 than an A-33 and a BK-7m (if I was looking for a light 76 setup). Unless MP3's were a big part of your show. And I still have yet to hear an arranger VH that was as good as the newer dedicated units...

Personally, my mind is being blown by the thought of one of these and a Kronos or a MoXF. Best of both worlds, half the weight!

I think it would be a real cool partner to the 12 lb Yamaha NP-30...even if to provide mainly basic accompaniment for the piano player who might want to play a few dance tunes, or some swing tunes or Jazz Ballads with neat drums and walking bass...and Latin tunes would be really enhanced.

As far as extra wires, it would be just one midi cable, and a pair of audio cables...plus the AC adaptor, of course.

I think the toughest issue would be where to place the module so the buttons are easily accessible.

Ian