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Concert Instruments

class Instrument
{
  ...
  start();            // start process
  stop();             // terminate process

  async();            // independent mode
  leader(Instrument); // back to leader mode

  String wait();      // wait for next beat
  wait(String)        // wait for named beat
  ...
}

class SlideViewer extends Instrument
{
  ...
  hide();             // hide presentation
  show();             // show presentation
  ...
}