DirectSound: setting the volume to a percentage

The Volume-Property in the 开发者_如何学编程SecondaryBuffer class seems to be strange, because a worth around -4000 is 0%, and 0 is 100%, how can I set the Volume to a precise percentage or get the lowest Volume to do it myself?

assuming your percentage is a double between 0 and 1 and named volumePercentage:

double adjustedVolume = (1d - volumePercentage) * -4000d;