code: def _get_support_sound_mode(self):
          
          if self._receiver_type == AVR_X_2016.type:
              return self._get_support_sound_mode_avr_2016()
          else:
              return self._get_support_sound_mode_avr()
docs: Get if sound mode is supported from device.
  
          Method executes the method for the current receiver type.