Thanks for your answer Steven.
Is the Xbox stream affected by the player option "Dynamically normalise the volume of streams", because I've noticed far less clipping and better overall listening experience compared to the Xbox music app for Windows 8 or their web-player. If this is true, it's a big plus for your plugin implementation. No online streaming service has this feature, as far as I know, although Spotify has a "Set the same volume level for all tracks" option, it doesn't work as well as your implementation.
Is this feature following the EBU R128 -18LUFS target volume, or?
By the way, am I the only one, who has abrupt cuts the last seconds of each track, as it isn't finished properly?