|Microsoft DirectX 9.0|
Signals that the current audio stream number changed for the main title.
DWORD value indicating the new user audio stream number. Audio stream numbers range from 0 to 7. Stream 0xFFFFFFFF indicates that no stream is selected.
The current audio stream can change automatically with a navigation command authored on the disc as well as through application control by using the IDvdControl2 interface.
This event is raised in all domains.