code: def resolve_sound(self, sound):
          
          sound = sound if isinstance(sound, Sound) else self.system[sound]
          if sound.name in self.data:
              return '//'.join([x['grapheme'] for x in self.data[sound.name]])
          raise KeyError(":td:resolve_sound: No sound could be found.")
docs: Function tries to identify a sound in the data.
  
          Notes
          -----
          The function tries to resolve sounds to take a sound with less complex
          features in order to yield the next approximate sound class, if the
          transcription data are sound classes.