private void GetAudioEndpointVolume()
{
object result;
Marshal.ThrowExceptionForHR(_realDevice.Activate(ref _audioEndpointVolumeGuid, CLSCTX.ALL, IntPtr.Zero, out result));
_audioEndpointVolume = new AudioEndpointVolume(result as IAudioEndpointVolume);
}
internal AudioEndpointVolumeCallback(AudioEndpointVolume parent)
{
_Parent = parent;
}