static Set<S> cereprocPlusLocalVoices() {
  Set<S> set = setPlus(cereprocVoices(), "Kevin");
  addAll(set, map(flite_listVoices(), func(S s) -> S { "flite/" + s }));
  if (voiceRSS_hasKey()) set.add("voice-rss/en-us");
  ret set;
}