Read my forum about Astral Projection.
http://www.spellsofmagic.com/read_post.html?post=559676 (Easier way to A.P.)
Go to the Astral Projection forums, and go to the thread that says "Easier way to A.P." read it, it should help you.
Planar I really don't know how to do that.
Well if it's a vibrational frequence that means your soul was getting ready to leave your body, but as I said on my post, don't be mad if you don't have luck the first time, it takes practice.