RBM, I did find some interesting info on the Google Patents website. Especially this one - Method of and Apparatus for Inducing Desired States of Consciousness which is credited to Monroe- http://www.google.com/patents?id=FQMiAA ... e&q&f=true
There are even schematics and diagrams at the top for the apparatus. (Is this simliar to some of the Monroe equipment Tom experimented with I wonder?)
Section 6 describes something called a Septon - "In this preferred embodiment, three binaural beat frequency signals are created between two audio carrier channels, and two amplitude beats per channel also are created, yielding a total of seven beat signals. The inventor has coined the term Septon for this set of beat signals."
It looks rather complicated. This example sure sounds like some of the Gateway CD tracks I have.
"A standard program according to this preferred embodiment would employ the following sound sequence:
Signal Group A (comprised of replicated EEG waveforms having dominant values in the alpha range) Signal Group B (15 dB below Group A, generated simultaneously with the sounds of Group A, and comprised of replicated EEG waveforms having dominant values in the theta range)
Phased Pink Sound (six seconds, peak-to-peak, on both left and right channels, 20 dB below Group A)
Voice Inserts (repeated at 40 second intervals, 10 dB below Group A, simultaneously with the other sounds, and comprising short sequences of phrases like "relax" "let go", and "sleep")
5-20 minutes: Signal Group B
Signal Group C (20 dB below Group B, generated simultaneously with Group B, and comprised of replicated EEG waveforms having dominant values in the delta range)
Phased Pink Sound (15 dB below Group B, having aduration as in the first interval)
Voice Inserts (10 dB below Group B, comprised as above)
20-40 minutes: Signal Group C
Signal Group D (10 dB below Group C, generated simultaneously with Group C, and comprised of replicated EEG waveforms having dominant values in the lower delta range)
Phased Pink Sound (10 dB below Group C, having a duration as in the first interval)
Voice Inserts (20 dB below Group C, comprised as above)"
There is more to this sequence and tons of technical stuff in this paper.
I also found another site that talks about layering frequencies - http://www.immrama.org/brainwave/harmoniclayers.html
. Note that I have not purchased nor listened to any of these CDs, but was more interested in the details of the technology.
For me, I think I am done looking into this topic further. There does appear to be something to the layering of frequencies that is beneficial to achieving certain states, but it appears to be too complex for me to figure out exactly how to mix them together myself. If it was crucial to anything of value, surely Tom would have hinted at mixing frequencies instead of just discussing the simple single ramp down to 4HZ. I will leave the mixing of frequencies to TMI, Jeffrey Thompson, and others who seem to do a much better job that I can do myself.