Are you sure that when you for example lock your tab with the external button the volume doesn't decrease? Try playing music with any player you want, increase volume with vodoo louder for example of + 5db and while you're listening your track hit the lockscreen button... Your volume will go to 0.0db, don't confuse yourself with the smart boost line at bottom... THE line will say + 5db but if you try to adjust volume you will understand that you are listening at 0.0db.. Try and say me something.