docs: def numchannels(samples:np.ndarray) -> int:
      """
      return the number of channels present in samples
  
      samples: a numpy array as returned by sndread
  
      for multichannel audio, samples is always interleaved,
      meaning that samples[n] returns always a frame, which
      is either a single scalar for mono audio, or an array
      for multichannel audio.
      """
      if len(samples.shape) == 1:
          return 1
      else:
          return samples.shape[1]