public UnaryCallSettings.Builder<SynthesizeLongAudioRequest, Operation>
        synthesizeLongAudioSettings() {
      return getStubSettingsBuilder().synthesizeLongAudioSettings();
    }
Returns the builder for the settings used for calls to synthesizeLongAudio.
java-texttospeech/google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1/TextToSpeechLongAudioSynthesizeSettings.java