old_contents: from moviepy.decorators import audio_video_fx
  
  from .volumex import volumex
  
  
  @audio_video_fx
  def audio_normalize(clip):
      """ Return an audio (or video) clip whose volume is normalized
          to 0db."""
  
      mv = clip.max_volume()
      return volumex(clip, 1 / mv)
  
new_contents: from moviepy.decorators import audio_video_fx
  
  from .volumex import volumex
  
  
  @audio_video_fx
  def audio_normalize(clip):
      """ Return a clip whose volume is normalized to 0db.
  
      Return an audio (or video) clip whose audio volume is normalized
      so that the maximum volume is at 0db, the maximum achievable volume.
  
      Examples
      ========
  
      >>> from moviepy.editor import *
      >>> videoclip = VideoFileClip('myvideo.mp4').fx(afx.audio_normalize)
  
      """
  
  
      mv = clip.max_volume()
      return volumex(clip, 1 / mv)
  
subject: Improve afx.audio_normalize documentation (#1046)