code: 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 import *
      >>> videoclip = VideoFileClip('myvideo.mp4').fx(afx.audio_normalize)
  
      """
      max_volume = clip.max_volume()
      if max_volume == 0:
          # Nothing to normalize.
          # Avoids a divide by zero error.
          return clip.copy()
      else:
          return multiply_volume(clip, 1 / max_volume)
  
label_desc: Use image node_id 1 for calling a global function with example usage: audio_normalize(clip) and returns: clip, multiply_volume