Actually MIDI capabilites have increasd beyond measure. Not just GM2 either.

Which makes these sorts of combinations even more possible today.

And if you get your head around sysex you can do anything on the modern synth.

Although Yamaha do tend to use a lot of CC data instead, which does make it easier to program.

As you would already know Nick, you can still do pretty much anything as they have developed their own CC commands for the many unused CC slots.

Nick, I reckon the PA2 and the Motif ES make a great combo.. The Motif XS and the S900 would be AWESOME!!! Go for it.

I use the PA2xpro with a Motif ES Rack. You can specify any or all of the arranger parts to be transmitted. It is the same on the Tyros, so I imagine it would be the same on the S900.

Dennis