public PlayingEventViewmodel(Engine engine)
{
_engine = engine;
_engine.EngineOperation += _onEngineOperation;
_engine.EngineTick += _onEngineTick;
PlayingEvent = _engine.PlayingEvent();
_sliderTimer = new DispatcherTimer();
_sliderTimer.Interval = TimeSpan.FromMilliseconds(200);
_sliderTimer.Tick += SliderPositionDelayedUpdate;
}