"nonfacsimile": Standard braille music (default). Omits print-layout signs
(clefs, ottavas, page numbers). Output is a continuous stream of measures.
"facsimile": Mirrors visual score layout. Includes clef signs, ottava brackets,
and other print-presentation signs. Line breaks match print systems.
Requires GraphicalMusicSheet (after render()). See Music Braille Code 2015 ยง1.1.
Braille output format.