-ADD_ACKNOWLEDGER (Arpeggio_engraver, stem);
-ADD_ACKNOWLEDGER (Arpeggio_engraver, rhythmic_head);
+
+void
+Arpeggio_engraver::boot ()
+{
+ ADD_LISTENER (Arpeggio_engraver, arpeggio);
+ ADD_ACKNOWLEDGER (Arpeggio_engraver, stem);
+ ADD_ACKNOWLEDGER (Arpeggio_engraver, rhythmic_head);
+ ADD_ACKNOWLEDGER (Arpeggio_engraver, note_column);
+}