docs: def loudest_time(self, start=0, duration=0):
          """Find the loudest time in the window given by start and duration
          Returns frame number in context of entire track, not just the window.
  
          :param integer start: Start frame
          :param integer duration: Number of frames to consider from start
          :returns: Frame number of loudest frame
          :rtype: integer
          """
          if duration == 0:
              duration = self.sound.nframes
          self.current_frame = start
          arr = self.read_frames(duration)
          # get the frame of the maximum amplitude
          # different names for the same thing...
          # max_amp_sample = a.argmax(axis=0)[a.max(axis=0).argmax()]
          max_amp_sample = int(np.floor(arr.argmax()/2)) + start
          return max_amp_sample