The waveOutSetVolume function sets the volume level of the specified waveform-audio  output device.
MMRESULT waveOutSetVolume(
    HWAVEOUT hwo,	
    DWORD dwVolume	
   );	
 
Parameters
hwo
Handle of an open waveform-audio output device. This parameter can also be a device identifier.
dwVolume
New volume setting. The low-order word contains the left-channel volume setting, and the high-order word contains the right-channel setting. A value of 0xFFFF represents full volume, and a value of 0x0000 is silence.
If a device does not support both left and right volume control, the low-order word of dwVolume specifies the volume level, and the high-order word is ignored.
 
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following:
MMSYSERR_INVALHANDLE	Specified device handle is invalid.
MMSYSERR_NODRIVER	No device driver is present.
MMSYSERR_NOMEM	Unable to allocate or lock memory.
MMSYSERR_NOTSUPPORTED	Function is not supported.
			
		
 
	
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