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    EXPUNGE - indicate a desire to remove the Audio device

    The Expunge routine is called when a user issues a RemDevice call.  By
    the time it is called, the device has already been removed from the
    device list, so no new opens will succeed.  The existence of any other
    users of the device, as determined by the device open count being
    non-zero, will cause the Expunge to be deferred.  When the device is
    not in use, or no longer in use, the Expunge is actually performed.

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