@java.lang.Override
  public com.google.cloud.texttospeech.v1.AdvancedVoiceOptionsOrBuilder
      getAdvancedVoiceOptionsOrBuilder() {
    return advancedVoiceOptions_ == null
        ? com.google.cloud.texttospeech.v1.AdvancedVoiceOptions.getDefaultInstance()
        : advancedVoiceOptions_;
  }
<pre>
Advanced voice options.
</pre>

<code>optional .google.cloud.texttospeech.v1.AdvancedVoiceOptions advanced_voice_options = 8;
</code>
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesizeSpeechRequest.java