This message is sent to a window when the specified output buffer is being returned to the application. Buffers are returned to the application when they have been played, or as the result of a call to waveOutReset.
WORD wParam
Specifies a handle to the waveform output device that played the buffer.
LONG lParam
Specifies a far pointer to a WAVEHDR structure identifying the buffer.
None
WOM_DONE