public OperationCallSettings.Builder<
            SynthesizeLongAudioRequest, SynthesizeLongAudioResponse, SynthesizeLongAudioMetadata>
        synthesizeLongAudioOperationSettings() {
      return getStubSettingsBuilder().synthesizeLongAudioOperationSettings();
    }
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