Like this is what it says:""The Feta font provides musical symbols at eight different sizes. Each font is tuned for a different staff size: at a smaller size the font becomes heavier, to match the relatively heavier staff lines. The recommended font sizes are listed in the following table:""
And the table of the different font names - but I do not see a command that I need to write to change the font Feta18-20-22 or whatever in the place where it tells me about it.
Dearly regards - Darkijah