+ADD_ACKNOWLEDGER (Note_head_line_engraver, rhythmic_head);
+ADD_TRANSLATOR (Note_head_line_engraver,
+ /* doc */ "Engrave a line between two note heads, for example a glissando. If "
+ " followVoice is set, staff switches also generate a line.",
+ /* create */ "Glissando VoiceFollower",
+ /* read */ "followVoice",
+ /* write */ "");