Hello You are right in practice 7/2 tone is not used. You can delete. I personally don't use it.
Here are the files I modified in 2017 : lily-library.scm and define-note-names.scm The hel-arabic.ly file must be modified => You must remove: (5/2 . "accidentals.sharp.slashslashslash.stemstem") 7/2 . "accidentals.sharp.slashslash.stemstemstem") (-5/2 . "accidentals.flatflat.slash") (-7/2 . "accidentals.flat.slashslash") from HelmakamGlyphs = #'( (1 . "accidentals.doublesharp") (1/4 . "accidentals.sharp.slashslash.stem") (3/4 . "accidentals.sharp.slashslashslash.stem") (5/2 . "accidentals.sharp.slashslashslash.stemstem") (7/2 . "accidentals.sharp.slashslash.stemstemstem") (1/2 . "accidentals.sharp") (0 . "accidentals.natural") (-1/4 . "accidentals.flat.slash") (-3/4 . "accidentals.mirroredflat.flat") (-5/2 . "accidentals.flatflat.slash") (-7/2 . "accidentals.flat.slashslash") (-1/2 . "accidentals.flat") (-1 . "accidentals.flatflat") ) Two files need to be modified: 1) lily-library.scm 2) define-note-names.scm 1) You have to delete (define-public FIVE-HALF-FLAT -5/2) (define-public SEVEN-HALF-FLAT -7/2) (define-public FIVE-HALF-SHARP 5/2) (define-public SEVEN-HALF-SHARP 7/2) file : lily-library.scm 2) You have to delete (cfhb . ,(ly:make-pitch -1 0 FIVE-HALF-FLAT)) (dfhb . ,(ly:make-pitch -1 1 FIVE-HALF-FLAT)) (efhb . ,(ly:make-pitch -1 2 FIVE-HALF-FLAT)) (ffhb . ,(ly:make-pitch -1 3 FIVE-HALF-FLAT)) (gfhb . ,(ly:make-pitch -1 4 FIVE-HALF-FLAT)) (afhb . ,(ly:make-pitch -1 5 FIVE-HALF-FLAT)) (bfhb . ,(ly:make-pitch -1 6 FIVE-HALF-FLAT)) (cfhd . ,(ly:make-pitch -1 0 FIVE-HALF-SHARP)) (dfhd . ,(ly:make-pitch -1 1 FIVE-HALF-SHARP)) (efhd . ,(ly:make-pitch -1 2 FIVE-HALF-SHARP)) (ffhd . ,(ly:make-pitch -1 3 FIVE-HALF-SHARP)) (gfhd . ,(ly:make-pitch -1 4 FIVE-HALF-SHARP)) (afhd . ,(ly:make-pitch -1 5 FIVE-HALF-SHARP)) (bfhd . ,(ly:make-pitch -1 6 FIVE-HALF-SHARP)) (cshb . ,(ly:make-pitch -1 0 SEVEN-HALF-FLAT)) (dshb . ,(ly:make-pitch -1 1 SEVEN-HALF-FLAT)) (eshb . ,(ly:make-pitch -1 2 SEVEN-HALF-FLAT)) (fshb . ,(ly:make-pitch -1 3 SEVEN-HALF-FLAT)) (gshb . ,(ly:make-pitch -1 4 SEVEN-HALF-FLAT)) (ashb . ,(ly:make-pitch -1 5 SEVEN-HALF-FLAT)) (bshb . ,(ly:make-pitch -1 6 SEVEN-HALF-FLAT)) (cshd . ,(ly:make-pitch -1 0 SEVEN-HALF-SHARP)) (dshd . ,(ly:make-pitch -1 1 SEVEN-HALF-SHARP)) (eshd . ,(ly:make-pitch -1 2 SEVEN-HALF-SHARP)) (fshd . ,(ly:make-pitch -1 3 SEVEN-HALF-SHARP)) (gshd . ,(ly:make-pitch -1 4 SEVEN-HALF-SHARP)) (ashd . ,(ly:make-pitch -1 5 SEVEN-HALF-SHARP)) (bshd . ,(ly:make-pitch -1 6 SEVEN-HALF-SHARP)) file : define-note-names.scm Please keep me informed Best regards HASSAN EL FATIHI