public Builder mergeVoiceClone(com.google.cloud.texttospeech.v1.VoiceCloneParams value) {
      if (voiceCloneBuilder_ == null) {
        if (((bitField0_ & 0x00000010) != 0)
            && voiceClone_ != null
            && voiceClone_
                != com.google.cloud.texttospeech.v1.VoiceCloneParams.getDefaultInstance()) {
          getVoiceCloneBuilder().mergeFrom(value);
        } else {
          voiceClone_ = value;
        }
      } else {
        voiceCloneBuilder_.mergeFrom(value);
      }
      if (voiceClone_ != null) {
        bitField0_ |= 0x00000010;
        onChanged();
      }
      return this;
    }
<pre>
Optional. The configuration for a voice clone. If
[VoiceCloneParams.voice_clone_key] is set, the service chooses the voice
clone matching the specified configuration.
</pre>

<code>
.google.cloud.texttospeech.v1.VoiceCloneParams voice_clone = 5 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/VoiceSelectionParams.java