First – I have my Pa4x a short time. My answer may be correct.
The SongBook in the Pa900 and the Pa4x are not identical; there are some differences. I did exactly what Tony is doing with his Pa900 when I had it.

After loading my Pa900 SongBook into the Pa4x I found it easier to set up the same song with the style and that was needed – then I deleted the original song. Keeping the original song helped me to keep my original format.

I think Don and a few other members deleted the entire SongBook collection,

Hey, I’m having one good time. It’s not always easy to find something this exciting. I guess it’s because it’s ALL ABOUT MUSIC.

John C.
PS, Tony if the lotto comes in the first thing I am going to do is buy you a Pa4x. (smile)