public final int getNumber() {
    if (this == UNRECOGNIZED) {
      throw new java.lang.IllegalArgumentException(
          "Can't get the number of an unknown enum value.");
    }
    return value;
  }
<pre>
A gender-neutral voice. This voice is not yet supported.
</pre>

<code>NEUTRAL = 3;</code>
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SsmlVoiceGender.java