private void _triggerResult()
{
if (_playbackStarted)
{
// round the tapped time to the nearest millisecond
_newTappedMarks.Add(TimeSpan.FromMilliseconds(Math.Round(_timingSource.Position.TotalMilliseconds)));
panelMarkView.BackColor = _displayedCollection.MarkColor;
timerMarkHit.Start();
}
}