Hi Paul, > is "custdyn" already in Lily or did you define it somewhere?
Harm built it (see, e.g., https://lists.gnu.org/archive/html/lilypond-user/2019-09/msg00159.html), but I changed the name of the function in my own include file(s). Hope that helps! Kieren. ________________________________ Kieren MacMillan, composer (he/him/his) ‣ website: www.kierenmacmillan.info ‣ email: i...@kierenmacmillan.info