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WIDM_START
 
        This message is sent to a waveform input device driver to begin
        waveform recording.
 
Parameters
        DWORD dwParam1
            Unused.
 
        DWORD dwParam2
            Unused.
 
Return value
        The return value is an error code, or zero (MMSYSERR_NOERROR) if
        the operation is successful. Possible error codes are:
 
        MMSYSERR_NOTENABLED
            The driver failed to load or initialize.
 
Comments
        Buffers are returned to the client either when full or when a
        WIDM_RESET message is received. The driver should place the
        actual length of data in the dwBytesRecorded field in the header.
         If input is already started, just return MMSYSERR_NOERROR.
 
See also
        WIDM_STOP
 
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