private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.texttospeech.v1beta1.Voice,
            com.google.cloud.texttospeech.v1beta1.Voice.Builder,
            com.google.cloud.texttospeech.v1beta1.VoiceOrBuilder>
        getVoicesFieldBuilder() {
      if (voicesBuilder_ == null) {
        voicesBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.texttospeech.v1beta1.Voice,
                com.google.cloud.texttospeech.v1beta1.Voice.Builder,
                com.google.cloud.texttospeech.v1beta1.VoiceOrBuilder>(
                voices_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
        voices_ = null;
      }
      return voicesBuilder_;
    }
<pre>
The list of voices.
</pre>

<code>repeated .google.cloud.texttospeech.v1beta1.Voice voices = 1;</code>
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/ListVoicesResponse.java