Hello Akki.
I use text files for each song. They are stored together with the song settings, usually under the 1, 2 or 3 Reg buttons. You cannot save them under buttons 2-8, because then the text page jumps to the beginning of the text. (Leave the Memori`s box unchecked). Large Font holds 11 lines (SX700), Proportional Large 10 lines. If your vision is sharper, you can use smaller fonts.
Lyrics usually require 1-15 pages. The page can be turned with the Inc+ or dec- button.
I have the lyrics in a separate song file about 250.
In order to quickly find words, I have a file of words under the Assignable 2 button, the pill can find it there.
When I select a new song and press 1reg. button, all settings appear immediately. Sometimes I don't leave the lyrics page. As soon as I press 1, the text jumps to the display. I select songs from Reg.Select +/-.
If there is interest, I can share my experience.