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