diff --git a/gtk2_ardour/note_player.cc b/gtk2_ardour/note_player.cc
index cb148f5f0b..d0396e588d 100644
--- a/gtk2_ardour/note_player.cc
+++ b/gtk2_ardour/note_player.cc
@@ -34,22 +34,15 @@ NotePlayer::NotePlayer (std::shared_ptr<MidiTrack> mt)
 
 NotePlayer::~NotePlayer ()
 {
-	clear ();
 }
 
 void
 NotePlayer::add (std::shared_ptr<NoteType> note)
 {
+	/* Must not be called once play() has been called */
 	notes.push_back (note);
 }
 
-void
-NotePlayer::clear ()
-{
-	off ();
-	notes.clear ();
-}
-
 void
 NotePlayer::on ()
 {
@@ -63,8 +56,7 @@ NotePlayer::play ()
 {
 	on ();
 
-	/* note: if there is more than 1 note, we will silence them all at the same time
-	 */
+	/* note: if there is more than 1 note, we will silence them all at the same time */
 
 	const uint32_t note_length_ms = 100;
 
diff --git a/gtk2_ardour/note_player.h b/gtk2_ardour/note_player.h
index 94c60b3ab4..e3cad02a33 100644
--- a/gtk2_ardour/note_player.h
+++ b/gtk2_ardour/note_player.h
@@ -27,6 +27,10 @@
 
 #include "evoral/Note.h"
 
+namespace Temporal {
+	class Beats;
+}
+
 namespace ARDOUR {
 	class MidiTrack;
 }
@@ -40,13 +44,11 @@ public:
 
 	void add (std::shared_ptr<NoteType>);
 	void play ();
-	void on ();
-	void off ();
-	void clear ();
-
-	static bool _off (NotePlayer*);
 
 private:
+	void on ();
+	void off ();
+	static bool _off (NotePlayer*);
 	typedef std::vector< std::shared_ptr<NoteType> > Notes;
 
 	std::shared_ptr<ARDOUR::MidiTrack> track;