Arguments:
NODE the font tree to modify.
- NAME is the basename for the music font. NAME-DESIGNSIZE.otf should be the music font,
+ NAME is the basename for the music font. NAME-DESIGNSIZE.otf should be the music font,
NAME-brace.otf should have piano braces.
DESIGN-SIZE-ALIST is a list of (ROUNDED . DESIGN-SIZE). ROUNDED is
a suffix for font filenames, while DESIGN-SIZE should be the actual