code: def manipulate(self, data, method, start_pos, end_pos):
      aug_data = data.copy()
      if method == "minmax":
          new_data = self._min_max(aug_data[start_pos:end_pos])
      elif method == "max":
          new_data = self._max(aug_data[start_pos:end_pos])
      elif method == "standard":
          new_data = self._standard(aug_data[start_pos:end_pos])
  
      aug_data[start_pos:end_pos] = new_data
  
      return aug_data
  
file_path: nlpaug/nlpaug/model/audio/normalization.py
imports: import numpy
  from nlpaug.model.audio import Audio
label_desc: Use image node_id 1 for calling the Normalization obj's underlying member method code with example usage: obj.manipulate(data, method, start_pos, end_pos) and returns: aug_data