public Builder clearVoice() {
      bitField0_ = (bitField0_ & ~0x00000002);
      voice_ = null;
      if (voiceBuilder_ != null) {
        voiceBuilder_.dispose();
        voiceBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. The desired voice of the synthesized audio.
</pre>

<code>
.google.cloud.texttospeech.v1beta1.VoiceSelectionParams voice = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeSpeechRequest.java