public Builder setVoiceClone(com.google.cloud.texttospeech.v1beta1.VoiceCloneParams value) {
      if (voiceCloneBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        voiceClone_ = value;
      } else {
        voiceCloneBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000010;
      onChanged();
      return this;
    }
<pre>
Optional. The configuration for a voice clone. If
[VoiceCloneParams.voice_clone_key] is set, the service will choose the
voice clone matching the specified configuration.
</pre>

<code>
.google.cloud.texttospeech.v1beta1.VoiceCloneParams voice_clone = 5 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/VoiceSelectionParams.java