(alteration ,number? "Alteration for figured bass.")
(alternative-dir ,ly:dir? "Indicates if an AlternativeMusic is the
First (-1), Middle (0), or Last (1) of group of alternate endings.")
(alteration ,number? "Alteration for figured bass.")
(alternative-dir ,ly:dir? "Indicates if an AlternativeMusic is the
First (-1), Middle (0), or Last (1) of group of alternate endings.")