public Builder clearAdvancedVoiceOptions() {
      bitField0_ = (bitField0_ & ~0x00000010);
      advancedVoiceOptions_ = null;
      if (advancedVoiceOptionsBuilder_ != null) {
        advancedVoiceOptionsBuilder_.dispose();
        advancedVoiceOptionsBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Advanced voice options.
</pre>

<code>
optional .google.cloud.texttospeech.v1beta1.AdvancedVoiceOptions advanced_voice_options = 8;
</code>
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeSpeechRequest.java