Hi. Thanks for your replies. I was 99% certain it would be compatible other than the additional styles/voices on the S910 which you mentioned. I play for church services and I currently have a PSR 2000 at home and a PSR S900 which stays at church. As you know these 2 are not compatible so I wanted to make sure that my current S900 registrations would work on the S910. I don't feel the need to upgrade from S900 to S910, but the S910 would be a good replacement for my PSR 2000, although I would keep the S910 at church and the S900 at home.