code: public void addSayCommand(String message) {
          StringBuilder buf = new StringBuilder();
          buf.append("(say ");
          buf.append(message);
          buf.append(')');
          fifo.add(fifo.size(), buf.toString());
      }
docs: This command broadcasts the message throughout the field. Any player
  near enough (specified with audio_cut_dist default 50.0 meters), with
  enough hearing capacity will hear the message.
  
  @param message A valid String to say.