Description of which voice to use for speech synthesis.
name Optional. The name of the voice. If not set, the service
will choose a voice based on the other parameters such as
For the list of available voices, please refer to `Supported
ssml_gender Optional. The preferred gender of the voice. If not set, the
service will choose a voice based on the other parameters
such as language_code and
Note that this is only a preference, not requirement. If a
voice of the appropriate gender is not available, the
synthesizer substitutes a voice with a different gender
rather than failing the request.