The reason it is so complicated at the moment is the very thing I brought up... They do not communicate anything about which Variation, Fill, Intro or Ending you select to each other.

So, you can get them to start, you can get them play together, you can select what sound you want on the master keyboard.

But... Once you have them both running, you will have to do all the Variation and Fill selections on BOTH arrangers by hand. Hardly optimal! This is where I would like all that consider this ability would be useful to contact the manufacturers and start making noise to have them all standardize the Style Division codes.

If this were done, the rest is pretty simple... A Performance allows you to mute each individual style Part (or you can set their volumes to zero), so by simply pairing Performances on the Master and Slave arranger, you easily decide which one plays the drums, the bass, the guitars, horns, strings etc..

All you would do is select both Performances, then run the master arranger normally... and everything else simply just happens. Simple, easy, powerful beyond belief!

Please contact your manufacturers. This would be easy for them to do, but they are only going to do it if sufficient people show there is a demand for it. Or they will continue to cripple our arrangers as they have for decades.