I'm not sure exactly how to do this, but i may be able to give you a few starting points. Right click the Realtech start icon and go to audio devices. Select the device you wish to be able to modify and go to properties. Go to the advanced tab and check "allow applications to take exclusive control of the device". I'm not sure which driver set/ software directly controls your volume keys, but that should allow it to take control if you specify. Hope this helps. (Generally this is used for software media players, but it may apply to buttons as well)
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