I'm using the mp3 version, rip from the original files. What I mean is the original mp3 comes with music together with the sound but mine is just the sound.
Just make sure you relax yourself. Many said that the tolerance level drop as you go along instead of increasing like drugs. My main concern is losing my mind.
See here for more tips :
http://anonym.to/?http://tinyurl.com/549bgr