Prs sx 900 is a great keabord, but what I don`t like about Yamaha generally is that you have to have a computer, you have to download apps to a computer, you have to transport things for keyboard to computer, load it in the app and work with them, you have to transport them back to keyboard. It is to much "have to". All of this should have been possible to do direct on the keyboard. Sorry Yamaha, I think it is not good enough.
Regards Ingar