Now...
This sounds friggan beast. You did great work on the orchestra synths and like the guy below, it does make the original track sound weak, akin to Dimmu Borgir's new album where they fucked over the guitars and shit with the keyboards and shit (not a fan of that new album, nope). This is sung in Swedish, right? It sounds very well done and everything but, perhaps you should collaborate with them and use the raw tracks and beef 'em up to match your stuff if you ever get the chance.