I’m systematically going through the Key Commands preferences to find useful commands I didn’t know. Most of them are pretty obvious and some obscure commands are quite useful to me. However, occasionally, I find some that I can’t figure out.
For example the “Add change to n” commands (see screenshot). What gets changed? I’ve tried using them on various note values and on trills but they don’t seem to do anything. A search of the manual returns over 2000 entries. The first 20 or so are not relevant.