code: def add_voice(self, voices, item):
          
          voice = None
          if item.get('type') == 'title':
              voice = self.get_title_voice(item)
          elif item.get('type') == 'app':
              voice = self.get_app_voice(item)
          elif item.get('type') == 'model':
              voice = self.get_app_model_voice(item)
          elif item.get('type') == 'free':
              voice = self.get_free_voice(item)
          if voice:
              voices.append(voice)
docs: Adds a voice to the list