Hey, just getting to the pre-production versions. I'm not sure how far things have progressed as I can't access your sites until I get home.
With Multiverse, the backing track is phenomenal. The only complaints I can raise are that the drums (programmed?) are a bit "busy" at points and could probably be simplified to better serve the track. Also, when the one vocal line does come in, it jumps so far out of the mix that it's incredibly jarring. It might do better with some heavy reverb on it and to pull it back to sit "inside" of the mix rather than "on top" of it.
Decaying World, as a whole, held together much better. Decent stuff all around though!