code: def multiply_stereo_volume(clip, left=1, right=1):
      """For a stereo audioclip, this function enables to change the volume
      of the left and right channel separately (with the factors `left`
      and `right`). Makes a stereo audio clip in which the volume of left
      and right is controllable.
  
      Examples
      --------
  
      >>> from moviepy import AudioFileClip
      >>> music = AudioFileClip('music.ogg')
      >>> audio_r = music.multiply_stereo_volume(left=0, right=1)  # mute left channel/s
      >>> audio_h = music.multiply_stereo_volume(left=0.5, right=0.5)  # half audio
      """
  
      def stereo_volume(get_frame, t):
          frame = get_frame(t)
          if len(frame) == 1:  # mono
              frame *= left if left is not None else right
          else:  # stereo, stereo surround...
              for i in range(len(frame[0])):  # odd channels are left
                  frame[:, i] *= left if i % 2 == 0 else right
          return frame
  
      return clip.transform(stereo_volume, keep_duration=True)
  
label_desc: Use image node_id 1 for calling a global function with example usage: multiply_stereo_volume(clip, left, right) and returns: clip, frame