ADD_ACKNOWLEDGER (Script_engraver, rhythmic_head);
ADD_ACKNOWLEDGER (Script_engraver, stem);
ADD_ACKNOWLEDGER (Script_engraver, note_column);
ADD_ACKNOWLEDGER (Script_engraver, stem_tremolo);
ADD_TRANSLATOR (Script_engraver,
ADD_ACKNOWLEDGER (Script_engraver, rhythmic_head);
ADD_ACKNOWLEDGER (Script_engraver, stem);
ADD_ACKNOWLEDGER (Script_engraver, note_column);
ADD_ACKNOWLEDGER (Script_engraver, stem_tremolo);
ADD_TRANSLATOR (Script_engraver,