waveOutGetVolume & waveOutSetVolume

Does anyone know how to use these API's?

Code for module

Code:

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Declare Function waveOutSetVolume Lib "winmm.dll" (ByVal uDeviceID As Long, ByVal dwVolume As Long) As Long
Declare Function waveOutGetVolume Lib "winmm.dll" (ByVal uDeviceID As Long, lpdwVolume As Long) As Long

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Code for a CommandButton

Code:

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' Get the volume
retval = waveOutGetVolume(0, volume)
volume = volume And &HFFFF

DisplayVol = Hex(volume)
MsgBox (DisplayVol)

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Code for another CommandButton

Code:

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' Set the volume to 50%
retval = waveOutSetVolume(0, &H7FFF7FFF)

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yeaa megatron what i want to do is have 2 buttons
1 button that will make the volume louder
1 button that will make the volume softer

do u understand that

thanks
trav