First off I have never owned a Yamaha keyboard, nothing wrong with them just never owned one.
One of the things I see happen with Yamaha's is the ability to transport and use registrations on different Yamaha keyboards via a usb stick.
I like the idea of this as it means that if two people are at the same club night they can use just one keyboard instead of taking two.
But as I own a Korg I did not think it was possible, but to a degree it is on the new Korg PA range of keyboards as compatability between the newer keyboards is a lot better.
So here`s my take on how to do it. Yamaha registrations = Korg Song book, I reckon ?
Create your a song book entery as per normal for your tune, using only the styles and sounds that came with your keyboard and in there original place on the keyboard.
Next do Save ALL, but instead of saving everything just tick the song book and save it to a usb stick. calling it say "Songbook. SET "
Now to load into a different Korg Keyboard, insert the usb stick, locate the "Songbook. SET " and click open the song book file,
scroll down to the song you saved, select it and press "Load" and it will place the entry into the song book on the Korg Keyboard song book
If you have done everything correctly it wil have exactly the same styles, voices, tempo, etc as the original
Anyway thats one way of doing it, but always open to better ways
Brian