static File cereproc_silent(S voice, S text) {
  text = trim(text);
  if (empty(text)) null;
  text = text.replaceAll("\\s+", " ");
  File file = prepareCacheProgramFile("#1004759", voice + "/" + urlencode(text) + ".mp3");
  if (!file.exists())
    saveBinaryFile(file, loadBinaryPageSilently(getSoundURLCereproc(text, voice)));
  ret file;
}