I just read your post today but I do have a couple recommendations for you. Indigo and Remembrance would be good choices from what I have read to date regarding both of them. If anyone else has some further guidance or input I also would appreciate any comments.

Blessings & Joy

I'm sorry I cannot discuss intelligently the article above, however, Monroe's hundreds of experiments in this area are most impressive to me and the reports I've heard from those who use hemisync. They have told me, at a certain point in it's use, they are able to put the tool aside, after learning how to reach a certain focus level through the memory of how it felt to be in an altered state.

As regarding tones and frequencies, I relate this to music. I've found for instance, when writing, using the left brain of language structure, if I have relaxing music on in the background, the writing proceeds smoothly, yet I may have to consciously make the piece not as one long sentence, like it wants to be, but broken into logical segmented communication, so that I know both lobes are now working with each other.
I have not used hemisync, yet I am thinking it is a very good tool for altered states of awareness.
So to speak, a place to start, a leaping off place, that we have never had before, and we need more explorers to report their experiences.
I did have a few obes just from listening to music, however I notice just before the obes, my left brain was also stimulated by a rote received from the tone I resonated with, which I was interpreting according to my beliefs. (beliefs change)

a rote is like a thought ball. a bunch of connected thoughts.

In chapter 20, Brainwave and their limitations, Austin explains that although we can measure the brainwaves of human subjects with EEG technology, these measurements give us no insight into "either the form or the content of that person's 'inner weather' or their 'mental Landscape'." (Austin, p. 84)

Indeed there is much more to the complexities and depths of human consciousness than the electromagnetic activity measurable with EEG technology. That notwithstanding, there are still intelligent correlations to be made about our consciousness and our brainwave activity (i.e. alpha waves are often associated with relaxation, sensual pleasure, etc…).

In light of the present conversation, perhaps the statement that "There is… no scientifically demonstrated effect-mechanism to support the notion that entrainment of the frequency-following response is responsible for alterations in consciousness" serves as another reminder of the complex holistic nature of human consciousness.

For when we are listening to brainwave entrainment audio such as that available through The Monroe Institute, that audial stimulation does not exist in a vacuum. So any alterations in consciousness which we experience while listening to such audio is can not be understood to be separate from this audial stimulus, nor can it be understood to be a function of this stimulus alone.

Indeed, if we listen to the same audio stimulus with headphones while standing on a crowded bus with our eyes open, we might anticipate different results than if we listen to the same audio patterns in an isolated chamber during seated meditation.

The exploration of our consciousness is a wonderful, life-giving and stimulating ongoing adventure.

Here's to our further understanding, enrichment, joy and fulfillment!