code: def match_sound_mode(self, sound_mode_raw):
          
          try:
              sound_mode = self._sm_match_dict[sound_mode_raw.upper()]
              return sound_mode
          except KeyError:
              smr_up = sound_mode_raw.upper()
              self._sound_mode_dict[smr_up] = [smr_up]
              self._sm_match_dict = self.construct_sm_match_dict()
              _LOGGER.warning("Not able to match sound mode: '%s', "
                              "returning raw sound mode.", sound_mode_raw)
          return sound_mode_raw
docs: Match the raw_sound_mode to its corresponding sound_mode.