Inquiry - (not sure if right section)

I'm deaf in one ear so all these various CD's will have no effect as my right ear has no hearing.

Although I've yet to start any research on obtaining OBE can I assume that the purpose of the CD is to reach a theata (sp?) brainwave state?

Aside from various meditative exercises are there any visual tools that would induce the same effect?

Thanks in Advance!

~ Wyldrose