public UnaryCallSettings.Builder<ListVoicesRequest, ListVoicesResponse> listVoicesSettings() {
      return getStubSettingsBuilder().listVoicesSettings();
    }
Returns the builder for the settings used for calls to listVoices.
java-texttospeech/google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1/TextToSpeechSettings.java