lib/rb-music/note.rb in motion-music-0.0.4 vs lib/rb-music/note.rb in motion-music-0.0.5

@@ -56,10 +56,10 @@
     end
     alias_method :enharmonically_equivalent_to?, :enharmonic?
 
     def midi_note_number
       # see http://www.phys.unsw.edu.au/jw/notes.html
-      12 * Math.log2(frequency / 440) + 69
+      @note_number ||= (12 * Math.log2(frequency / 440) + 69).round
     end
 
     def scale(name, octaves = 1)
       NoteSet.from_scale(Scale.new(latin, name), octave, octaves)
     end