3.2.20 clef-modifier-interface
The number describing transposition of the clef, placed below or above clef sign. Usually this is 8 (octave transposition) or 15 (two octaves), but LilyPond allows any integer here.
User settable properties:
clef-alignments
(list)An alist of parent-alignments that should be used for clef modifiers with various clefs
This grob interface is used in the following graphical object(s): ClefModifier.