|Microsoft DirectX 9.0|
Signals that a rate change in the playback has been initiated; the parameter lParam1 indicates the new playback rate being used.
LONG indicating the new playback rate. lParam1 < 0 indicates reverse playback mode. lParam1 > 0 indicates forward playback mode. The value of lParam1 is the actual playback rate multiplied by 10,000, that is, lParam1 = playback_rate * 10000.
This event is raised in the title domain.