>> Have you looked at >> http://lilypond.org/doc/v2.25/Documentation/notation/trills ? >> > Many times.
If you can't find something in the docs, you should try the LilyPond Snippet Repository next: https://lsr.di.unimi.it Entering 'trill' into the search box you will soon find https://lsr.di.unimi.it/LSR/Item?id=304 Werner
