It's not the staff I have issues with, it is how to fix the font in the
noteheads.
Dearly regards
- Darkijah
Just some background info. LilyPond is designed to use a certain font size given a specified staff height, as Karlin was suggesting by changing the staff instead of directly changing the font. Meaning, the default 5-line staff is 20 pts high and the feta20 font was designed to be optically appropriate for that size of staff. Similarly, feta18 is designed to be the best choice for an 18pt staff, and so on for the other sizes. Perhaps you could describe what you mean by "how to fix the font in the noteheads" a bit more so we can give you more accurate help?
Best,
Abraham