 pre-defined intervals

      _skipReverseByInterval: function(e) {
        if (!!e) e.preventDefault();

        var player = this,
            newTime = 0;

        switch (e.detail.key) {
          case 'up':
            if (player.largeSkip < player.timeLeft) newTime = player.currentTime + player.largeSkip;
            break;
          case 'down':
            if (player.currentTime - player.largeSkip > 0) newTime = player.currentTime - player.largeSkip;
            break;
          case 'right':
      