This method is provided as a convienant way for Macros and Filters to work on sequences. Since playback of a sequence is processor intensive, it is customary to pause playback before processing, and then restore the state once the processing has finished. This method (coupled with SequenceHoldState) accomplish this.
If the sequence was playing when the SequenceHoldState was called, then a PropertyChanged( ID_MV_SequenceDirection) event will be fired when playback is resumed.