X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fcontrol-track-performer.cc;h=82beebe122fb002066f0fede1a4303c67fcbadd7;hb=66322a1a82d9586b56b3faee18588bbe04e82799;hp=84f8044b4728a45b5248c43b7663cb3f9d2e3f78;hpb=f93e4199873c91ae32f0e84a610d14853dc379df;p=lilypond.git

diff --git a/lily/control-track-performer.cc b/lily/control-track-performer.cc
index 84f8044b47..82beebe122 100644
--- a/lily/control-track-performer.cc
+++ b/lily/control-track-performer.cc
@@ -13,7 +13,7 @@ class Control_track_performer : public Performer
 {
   Audio_staff *control_track_;
 
-  void add_text (Audio_text::Type, string);
+  void add_text (Audio_text::Type, const string&);
   TRANSLATOR_DECLARATIONS (Control_track_performer);
 protected:
 
@@ -40,7 +40,7 @@ Control_track_performer::acknowledge_audio_element (Audio_element_info info)
 }
 
 void
-Control_track_performer::add_text (Audio_text::Type text_type, string str)
+Control_track_performer::add_text (Audio_text::Type text_type, const string &str)
 {
   Audio_item *text = new Audio_text (text_type, str);
   control_track_->add_audio_item (text);
@@ -52,11 +52,15 @@ Control_track_performer::add_text (Audio_text::Type text_type, string str)
 void
 Control_track_performer::initialize ()
 {
-  control_track_ = new Audio_staff;
+  control_track_ = new Audio_control_track_staff;
   announce_element (Audio_element_info (control_track_, 0));
 
   string id_string = String_convert::pad_to (gnu_lilypond_version_string (), 30);
 
+  // The first audio element in the control track is a placeholder for the
+  // name of the MIDI sequence.  The actual name is stored in the element
+  // later before outputting the track (in Performance::output, see
+  // performance.cc).
   add_text (Audio_text::TRACK_NAME, "control track");
   add_text (Audio_text::TEXT, "creator: ");
   add_text (Audio_text::TEXT, id_string);