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	Class	Description
	OnConditionTrue	A custom advance type that triggers when a callback returns true.
	OnDurationComplete	A custom advance type that triggers after a specific duration has completed.
	OnEventComplete	A custom advance type that triggers when any event is dispatched by any IEventDispatcher host.
	OnPlayableComplete	A custom advance type that triggers when any playable item (presumably one item in the step) dispatches STOP or COMPLETE.
	SequenceAdvance	Base class for other custom advance types, does nothing on its own.