BOOL mmpGetMute(idMovie)
This function returns TRUE if the Movie Player instance is set to disable sound playback.
MMPID idMovie
Identifies the movie ID of the Movie Player instance.
Returns TRUE if sound playback is disabled, otherwise returns FALSE.
The mute setting affects only the playback of embedded sound cast members. It does not affect mci or mciWait script-channel commands, including those used to play streamed audio resources.
mmpSetMute