ADD_ACKNOWLEDGER (Slur_engraver, fingering);
ADD_ACKNOWLEDGER (Slur_engraver, note_column);
ADD_ACKNOWLEDGER (Slur_engraver, script);
ADD_ACKNOWLEDGER (Slur_engraver, text_script);
ADD_ACKNOWLEDGER (Slur_engraver, fingering);
ADD_ACKNOWLEDGER (Slur_engraver, note_column);
ADD_ACKNOWLEDGER (Slur_engraver, script);
ADD_ACKNOWLEDGER (Slur_engraver, text_script);