I've enjoyed reading the "whys" from each of you. Since I never get up on stage, have severe tingling fingers and could not play a piano if my life depended on it... I would buy an Arranger from Yamaha that is designed to appear to be "cut in half." I play chords only with my left hand, use the right hand to push buttons, scratch where I itch and do my best to "lead the orchestra" with my vocal.
Song-writing has different demands and the Arranger is God's Gift to Song-writers. Set that sucker up with the style you need to get the gist of the song across, turn all the Pan Knobs (via the screen) toward the center of the board, as if I were the conductor of the band... select the instruments, choir, etc., adjust each one's volume and record that sucker of a new song until I am blue in the face. (Over-simplification for the sake of time... you guys already know all of this stuff.)
I get tons of practice that way. Every now and then, something causes it all to coagulate and it actually sounds fairly decent. (Vocal removed from equation... LOL!)
I guess that's why I admire you talented folks so very much.
So, Don... have you ever played an S910? If so, what would I gain in acquiring a used but not abused S970? In today's market, song-writers need every trick in the book to sound "authentic" and unique.
----Dave Rice