code: def samplerate(self):
          
          rates = []
          for track in self._segments:
              for component in track:
                  # special case, where component is a wav file:
                  # it will set the master samplerate to match its own
                  if component.__class__.__name__ == 'Vocalization':
                      if component.samplerate() is not None:
                          rates.append(component.samplerate())
  
          if len(set(rates)) > 1:
              # error check
              # raise Exception("Wav files with different sample rates in same stimulus")
              logger = logging.getLogger('main')
              logger.error("Wav files with different sample rates in same stimulus")
              return None
          elif len(set(rates)) == 1:
              return rates[0]
          else:
              return DEFAULT_SAMPLERATE
docs: Returns the generation rate for this stimulus
  
          :returns: int -- the output samplerate (Hz)