Hi Bernie,
possibly most important things to learn is how to put your registrations and playlists together. I gather you have a lot of different types of files you use for performing.
Brilliant what you can save to a registration, from there, you create your playlists.
I didn’t have any old music finder records, personally decided to start from scratch, have the luxury of time, being a home player, but apparently they can be converted across.

Check out Yamahas website for downloadable content. Manuals etc.They have a Playlist that can be downloaded .

I spent my first few weeks sorting prior model Factory styles and deleting duplicates.
They’re downloadable at, if of any use. A lot of the Tyros styles work on Sx900 which is great.

https://psrtutorial.com/sty/yamaha/psr-sx900.html