I'm wondering if there is any way to alter the staff lines in Gregorio. I don't see the staff in the chant fonts (at least at first glance) so I'm guessing it is something that Gregorio calculates independently of the notation font loaded. I'm using LaTeX. What I'm trying to achieve is light grey bars which sit behind the notes, positioned to indicate where the half steps fall on the staff. See example below:
![image]()
