Ian.. One of the things I absolutely ADORE on the G70 is how well the PianoStyle Mode works. It has a pretty uncanny ability to track the changes and inversions around on pretty standard piano playing, so you can forget about triggering the arranger, and just concentrate on being pianistic, and the rhythm section follows you around like a champ. Especially if you just stick to Bass and Drums, you are in jazz trio heaven!

I am SURE the S900 has a similar mode, and I am pretty sure that if you hooked the P85 and the S900 together, and somehow managed to get the P85 to input to the NTA section of the S900, you could do the same thing. Trust me, it is utterly addictive once you get the hang of it