@Lempface: No need to switch things by hand - you can have individual notes for every song state (just activate state behavior for your notes content), then you can have different notes (i.e. lyrics or comments) for every song state.
If you want to go further than this, have a look at LivePrompter. This is a tool I’ve built to display lyrics, chords and also tabs and scroll them in time with the song. It cooperates pretty well with Cantabile; I use LivePrompter on a tablet and select Cantabile songs via MIDI remote from its touch interface. On the other hand, I use a Cantabile routing to control LivePrompter from my MIDI keyboard.
Have a look at this thread: Cantabile and LivePrompter - now better together! - there are some other useful threads linked to it.
LivePrompter is free - just have a look at it and play with it. Let me know if I can help get it to work…
Cheers,
Torsten