I know that it fits will in with the proceding track, Lost keys, which has the doctor questioning what is wrong with the patient, and then at the begninning of this track, the roaring barely intellegible voice, which I think is Maynard's criticism of lyric-less metal, might simulate the way a drug user hears themself with respect to the system demanding "How are You... you... you?!?!"

Also, the fact that the Rosetta Stone had three languages on it might suggest that a revelatory experience, perhaps one on DMT as you suggest, although cough syrup will equally make you shit your pants, has occured in the song. Note the comment I make on the whispers thread in Intension if you're interested in how the three voices might begin speaking at once at the beginning of the following track.

Just my 2c :P