code: def loadSignal(self, name, start=None, end=None):
          
          entry = self._getCacheEntry(name)
          if entry is not None:
              from analyser.common.signal import loadSignalFromWav
              return loadSignalFromWav(entry['path'], start=start, end=end)
          else:
              return None
docs: Loads the named entry from the upload cache as a signal.
          :param name: the name.
          :param start: the time to start from in HH:mm:ss.SSS format
          :param end: the time to end at in HH:mm:ss.SSS format.
          :return: the signal if the named upload exists.