Yeah, didn't you know Devin Townsend is an anagram of "Send Dev One Twin"? It's a cult where he takes twins apart to do biological experiments on them. The lyrics are full of subliminal messages. "Now I'm 29 years old, and I'm a million miles away". On Ocean Machine, there are songs called both "Bastard" and "Sister".
Here, he's been caught eating their brains:

Here, he's carrying out the amalgamation of the chemicals necessary to manipulate their genetic make-up:

Anyway, aside from that asshattery, there are some backwards lyrics hidden in tracks. I know for a fact that there's one in Stagnant (Leechy has it), I heard that there was one in Ziltoid too. With so many layers, the music becomes more exploitable... I don't think he intends on brainwashing anyone though. And if you're displeased by the fact that the music is having an impact on you, I'd recommend that you don't listen to the tracks which effect you.