The Motif is very cool !
It is not an arranger keyboard .
The sound are generated from the former EX5/EX7 workstation and also the current S30/S80 keyboards . The motif can syncipate samples to a midi sequence . The slider and knobs will control midi data . Knobs can control Cakewalk ,Steinberg etc.....
Easy to use .
I think Yamaha hit a home run ! Very cool keyboard ! Dan o
PS...Yes it has the 9000pro piano sample