var player = new CWPlayer({wpm: 25, effwpm: 20});
      player.on('indexchanged', () => {
        if (player.Index>-1) {
          console.log('playing ' + player.Text[player.Index]);
        }
      });
      player.on('parameterchanged', (param) => {
        console.log(`"${param}" changed to ${player[param]}`);
      });
      player.on('play', () => {
        window.setTimeout(() => {
          player.EffWPM = 17;
          player.WPM = 15; // this cause the EffWPM to be subsequently set to 20 wpm
        }, 1400);
      });