As to the X, it helps you get the photofocus, or, in Adrian's terms, "blurs our field of vision". I took the Subliminal Dynamics course years ago, and we didn't have the X or the blip page to help us. I find that they help a lot. I suspect this effect does help trigger alpha waves, but I can't be sure.
If you're thinking of using music to trigger the alpha state, I suppose it can help. The ones particularly suited to this purpose, I believe, would be the 60-beat Baroque music. But then again, it really isn't practical to always have the music on. (Especially in the library! )

KWLee