The audio files below are the relevant excerpts of the original, extensive, taped interview with Robert Anton Wilson. They are each sides of a tape and about 45 minutes long, and together are the third session of the famous "Sounds True" interview.
On this tape Wilson talks about how he got into thinking about these topics in the first place and then famously describes Timothy Leary's Eight Circuit Model of Human Consciousness. Leary is quoted to say that Wilson could explain his model than Leary could himself.
Sounds True Session 3:
Robert Anton Wilson Explains Everything
Old Bob Exposes His Ignorance
Totem Pill animated diagram of the 8 Circuit Model
The animation at the top of this story is called Totem Pill, a diagram of the Eight Circuit Model of Human Consciousness inspired by Wilson's description.