The ReleaseVibra() call releases the vibration
feature if it was previously reserved with a ReserveVibraL() method
for the client. If the client has not reserved the vibration feature, the
method does nothing. If the vibra is ON when it is released and no other client
has a suspended reservation, vibra is stopped.
The following code snippet demonstrates how to release the vibration feature:
iVibra->ReleaseVibra();