Apple Logic Pro X - Manual (Page 909)

Chapter 25 Preferences, project settings, and key commands 909
Important: If you do use MIDI Meaning, you need to adjust the settings before you begin to
insert accents and so on. This is because the settings have no influence on accents and phrasing
marks that have already been inserted.
Once set, the velocity and length of notes will be changed as soon as you attach one of these
symbols to a note. When you delete the symbol, note velocity and length are reset to their
initial values.