code: def ssml_prosody(self, words, volume=None, rate=None, pitch=None, **kwargs):
          
          return self.nest(SsmlProsody(words, volume=volume, rate=rate, pitch=pitch, **kwargs))
docs: Create a <Prosody> element
  
          :param words: Words to speak
          :param volume: Specify the volume, available values: default, silent, x-soft, soft, medium, loud, x-loud, +ndB, -ndB
          :param rate: Specify the rate, available values: x-slow, slow, medium, fast, x-fast, n%
          :param pitch: Specify the pitch, available values: default, x-low, low, medium, high, x-high, +n%, -n%
          :param kwargs: additional attributes
  
          :returns: <Prosody> element