//contextAbsoluteEffectStartTime = effectNode.StartTime
public void ApplyFilter(ISequenceFilterNode sequenceFilterNode, TimeSpan contextAbsoluteEffectStartTime)
{
// Pre-filters have context-absolute timing, so the intent needs to be told
// where in context-absolute time it is.
Intent.ApplyFilter(sequenceFilterNode, contextAbsoluteEffectStartTime + StartTime);
}