I am currently porting the IAudioVolumeDuckNotification to C#. But there is one problem with the declaration of the OnVolumeUnduckNotification method.
Msdn tells me this:

and my "audiopolicy.h" header file tells me this:

As you can see, in the msdn-version there is a second parameter. I am quite confused. Which one is the right one? Which one should I use and where can I report that mistake?
As requested the link to the msdn page: http://msdn.microsoft.com/en-us/library/windows/desktop/dd371012(v=vs.85).aspx