This message is sent to a waveform output device driver to pause playback of a waveform.
DWORD dwParam1
Unused.
DWORD dwParam2
Unused.
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.
If a waveform is currently playing, the driver should stop playing immediately without resetting its position. If playback has not yet begun, the driver should remember that it is in a paused state and delay playback until it receives a WODM_RESTART message. Data blocks received with the WODM_WRITE message should be placed in the output queue. If output is already paused, this message should have no effect, and the driver should return MMSYSERR_NOERROR.