docs: def add_music_cue(self, track, comp_cue, song_cue, duration=6.0,
                        padding_before=12.0, padding_after=12.0):
          """Add a music cue to the composition. This doesn't do any audio
          analysis, it just aligns a specified point in the track
          (presumably music) with a location in the composition. See
          UnderScore_ for a visualization of what this is doing to the
          music track.
  
          .. _UnderScore: http://vis.berkeley.edu/papers/underscore/
  
          :param track: Track to align in the composition
          :type track: :py:class:`radiotool.composer.Track`
          :param float comp_cue: Location in composition to align music cue (in seconds)
          :param float song_cue: Location in the music track to align with the composition cue (in seconds)
          :param float duration: Duration of music after the song cue before the music starts to fade out (in seconds)
          :param float padding_before: Duration of music playing softly before the music cue/composition cue (in seconds)
          :param float padding_after: Duration of music playing softly after the music cue/composition cue (in seconds)
          """
  
          self.tracks.add(track)
          
          pre_fade = 3
          post_fade = 3
          
          if padding_before + pre_fade > song_cue:
              padding_before = song_cue - pre_fade
              
          if padding_before + pre_fade > score_cue:
              padding_before = score_cue - pre_fade
  
          s = Segment(track, score_cue - padding_before - pre_fade,
                      song_cue - padding_before - pre_fade,
                      pre_fade + padding_before + duration +
                      padding_after + post_fade)
  
          self.add_segment(s)
          
          d = []
  
          dyn_adj = 1
          
          track.current_frame = 0
          
          d.append(Fade(track, score_cue - padding_before - pre_fade, pre_fade,
                        0, .1*dyn_adj, fade_type="linear"))
  
          d.append(Fade(track, score_cue - padding_before, padding_before,
                        .1*dyn_adj, .4*dyn_adj, fade_type="exponential"))
  
          d.append(Volume(track, score_cue, duration, .4*dyn_adj))
  
          d.append(Fade(track, score_cue + duration, padding_after,
                        .4*dyn_adj, 0, fade_type="exponential"))
  
          d.append(Fade(track, score_cue + duration + padding_after, post_fade,
                        .1*dyn_adj, 0, fade_type="linear"))
          self.add_dynamics(d)