int SyncAllVoices( )
This function queues a sync mark in each queue. Upon encountering a sync mark in a voice queue, the voice is turned off until sync marks are encountered in all other queues. This forces synchronization among all voices.
This function has no parameters.
The return value specifies the result of the function. It is zero if the function is successful. If a voice queue is full, the return value is S_SERQFUL.