[WIN32][AE] implemented an interface to ISimpleAudioVolume to set the vo...

...lume of the XBMC audio session. Unfortunately it seems to be that AE doesn't use GetVolume to get the current volume (of the sink) and relies on m_volume only.
This means that setting the volume in XBMC will also set the slider in the windows audio mixer. Setting the volume in the mixer will reduce the volume in XBMC but not shown in the XBMC volume bar. Changing the volume in XBMC afterwards will restore the old volume.
This is Vista and up only.