There's a tool called Track Comments that allows you to associate a comment (shown in a popup window) with a track.
There's also a tool called Track Pattern Comments that allows you to associate a comment with every line in every track pattern (with some numeric limitations).
*That* tool only lives on my computers because I've slacked off on testing (i.e. using it a whole lot) and releasing it. But it's what I've been using (more or less) for lyrics (as well as notes on stuff related to activity in specific track patterns).
Once I finish up a few other things (album completions for the most part) I'll go about releasing my track-pattern comment tool.
You can, of course, also use the song comments for lyrics.
Update: I uploaded the beta version of the Track Pattern Comments tool here: https://neurogami.com/code/
There are links to the code README and a direct download of the xrnx file.
Edited by Neurogami, 28 October 2017 - 05:50.