code: def verifyExpanded(self, samplerate):
          
          results = self.expandFunction(self.verifyComponents, args=(samplerate,))
          msg = [x for x in results if x]
          if len(msg) > 0:
              return msg[0]
          else:
              return 0
docs: Checks the expanded parameters for invalidating conditions
  
          :param samplerate: generation samplerate (Hz), passed on to component verification
          :type samplerate: int
          :returns: str -- error message, if any, 0 otherwise