public com.google.common.util.concurrent.ListenableFuture<
            com.google.cloud.texttospeech.v1beta1.ListVoicesResponse>
        listVoices(com.google.cloud.texttospeech.v1beta1.ListVoicesRequest request) {
      return io.grpc.stub.ClientCalls.futureUnaryCall(
          getChannel().newCall(getListVoicesMethod(), getCallOptions()), request);
    }
<pre>
Returns a list of Voice supported for synthesis.
</pre>
java-texttospeech/grpc-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/TextToSpeechGrpc.java