- ADD_LISTENER (Ligature_engraver, ligature);
- ADD_ACKNOWLEDGER (Ligature_engraver, rest);
- ADD_ACKNOWLEDGER (Ligature_engraver, ligature_head);
+ ADD_LISTENER (Mensural_ligature_engraver, ligature);
+ ADD_ACKNOWLEDGER (Mensural_ligature_engraver, rest);
+ ADD_ACKNOWLEDGER (Mensural_ligature_engraver, ligature_head);