Rupert Sheldrake talks about consciousness with Ralph Abraham, but covers in detail DMT, DMT Entities and a short reference to Changa!
http://www.sheldrake.org/Click on the "> Consciousness Research" link on the left hand side.
Or through the power of science:
A direct MP3 link:
I speak as if it were fact, but indeed this is just the insane ramblings of my ego - but my inner self seems to be nodding.