ADD_ACKNOWLEDGER (Phrasing_slur_engraver, script);
ADD_ACKNOWLEDGER_FOR (Phrasing_slur_engraver, extra_object, dots);
ADD_ACKNOWLEDGER_FOR (Phrasing_slur_engraver, extra_object, text_script);
ADD_ACKNOWLEDGER (Phrasing_slur_engraver, script);
ADD_ACKNOWLEDGER_FOR (Phrasing_slur_engraver, extra_object, dots);
ADD_ACKNOWLEDGER_FOR (Phrasing_slur_engraver, extra_object, text_script);