So using the example track above, the right ear is sent a 20Hz beat, compared to a 10Hz beat in the left ear.  As the right ear receives the higher frequency of beat, this works to increase the speed of the ‘left' brain hemisphere, which can be helpful for people with conditions like ADD, who are often found to have an abundance of slow wave activity in the left brain.
In the past, the most common method of inducing specific brainwave states was through the use of binaural beats. One specific beat was played in one ear (through stereo headphones) and a different beat was played through the other. What the brain would naturally do in hearing these variated beats was create its own beat from the combination of the two (ie if a beat at 100 Hz was played in one ear, and a beat of 110 Hz was played in the other, the brain would resonate at 10Hz). Aside from this directing the brain into a specific state, it also causes the two hemispheres of the brain to synchronize, promoting whole brain functioning. More recently, other methods have been discovered for inducing specific brainwave states, such as isochronic tones, and monaural beats, but the bottom line is that
It is a course that covers six months, after each month you move onto the next level of the program. The levels start off with the eye-opening Transcendence and move on to the literally mind expanding levels of Neptune’s Cave and Fusion. With each level you complete, your ability to solve problems and deal with stress goes through the roof, and you will feel a deep sense of emotional bliss.
Unlike many traditional therapies for dealing with stress, anxiety, depression or cognitive impairment, entrainment does not require a focused effort from the person having the therapy, as the brain instinctively follows the frequency. This makes it a much more effective therapy for managing some of these challenging conditions, by automatically inducing a sense of relaxation and a reduction in negative physical and emotional patterns.

This is the reason why I stress that one should ALWAYS read the instructions provided by the brainwave entrainment product creator, and always do their due diligence in researching the source of any products they purchase. When using a high quality product, these instructions are clear, precise, and always backed up by an extensive network of support and additional information. The product creators who have put in the necessary amount of effort and time to come up with a high quality product always make sure that you don’t get it wrong. 
I want you to know that I only post reviews and recommendations for products that have been personally tested by myself.  I have been in this game for more than seven years, and know that there are a lot of products out there in varying degrees of quality.  I have set up this page with the goal of saving you both time and money in exploring this realm, so you can get straight into the game of bringing yourself to that next level in your own personal development.
The brain produces electrical signals. These signals change depending on what we are doing and what mental state we are in. For instance when we sleep these signals are different from when we are awake. This brain activity can be measured with EEG. It will output in Hz (Hertz - cycles per second) these electrical signals. The most dominant brainwaves will tell us what sort of state a person is in. The slower vibration (lower Hz), the more relaxed that individual is. Using audio technology we get the brain to start following the beats or pulses in a sound if done exactly right.
Isochronic tones work just the same in delta as they do in alpha, theta and beta and they are widely used in the brainwave entrainment community to help people sleep. Like you, I’ve also seen some websites saying they don’t work in delta, but it’s a bit like the game of Chinese Whispers, where someone makes a comment and then after it gets passed around and shared a lot the message gets distorted and appears to be a fact. I don’t know of any scientific reason why they wouldn’t work in delta. I remember some people talking about this on a brainwave entrainment forum many years ago. They were saying they found isochronic tones a bit too abrupt for using to help them sleep and they preferred binaural beats, as they thought they were a more soothing sound. That was just a personal preference shared by a couple of prominent forum members at the time and some people then took that as a fact for everyone. That’s where I think that belief originated from.
This is a question I have noticed to concern many people, who are researching the issue. I have come across this question in forums, Yahoo Answers, in blogs, and all other sorts of  places. I can definitely empathize with someone who is looking to find a solution to a problem like anxiety, migraine, pain, etc., and needs reassurance and scientific proof that brainwave entrainment actually works!
I enjoy this one called: Cognition Enhancer For Clearer and Faster Thinking – Isochronic Tones (Electronic) … I seem to enjoy it. Any harm in just listening to this one every day for 30 minutes as a routine daily thing, just like brushing your teeth and making your bed. I would just use it at times when I’m working at my desk, maybe even reading the online news etc…Thoughts?
No matter what you use: USE it. At least for a couple weeks.  And have realistic expectations...  Brainwave Entrainment is not some pill or quick solution (even if there are some sessions that usually give almost immediate results e.g. for sleep induction or pain relief), it is a tool that requires training and works best in combination with good breathing / meditation techniques.
No. The frequencies are consistent throughout the duration of each music production we offer. It could be argued that a better approach is to change the frequency over time, starting at a higher frequency when the listener is alert and slowly ramping down as the music progresses and the listener becomes more relaxed. So why have we not taken this approach?

Theta waves have another interesting characteristic. The Earth has a measurable resonance of 7.83 hertz known as the Schumann resonance. Because the Schumann resonance is a constant background frequency surrounding all life, it may play a special role in biological activity. The Schumann resonance frequency falls within the range of theta brainwaves and may have something to do with why these brainwave frequencies are so powerful. 

I appreciate your compliment on my article Henry. I’ve been using and reading up on isochronic tones and brainwave entrainment for many years, so it was just a case of trying to put a lot of what I’ve learnt into one article. I don’t have a great deal of knowledge or experience in using hypnosis and subliminals, so I’m afraid I wouldn’t be in a position to create something so extensive in reviewing them.
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If you've heard of or used other brainwaves entrainment such as Holosync®, Hemi-Sync®, Brainsync®, Brainwave Generator, Awakened Mind System, NeuroProgrammer™, LifeFlow™, The Morry Method™, Brain Evolution System™, Perfect Meditation, EquiSync® or iNet™, it is important to understand that NeuralSync™ is significantly different and superior to all of them. It is light years beyond traditional sound therapy like binaural beats, isochronic tones or typical meditation programs.
I enjoy this one called: Cognition Enhancer For Clearer and Faster Thinking – Isochronic Tones (Electronic) … I seem to enjoy it. Any harm in just listening to this one every day for 30 minutes as a routine daily thing, just like brushing your teeth and making your bed. I would just use it at times when I’m working at my desk, maybe even reading the online news etc…Thoughts?
Delta brainwaves have the slowest frequencies, ranging between 0.1 and 4 hertz, and these are the brainwave states associated with deep sleep, trance states, and unconsciousness. Few people can remain awake during delta brainwaves states, although this state is recorded in awake infants between ages of three months and one year and also in babies just before birth. Delta waves are also linked with increased production of HGH, DHEA, and the neuro-transmitter serotonin.
There basically are a few things that you can use to deduce whether you think these claims are true, and will work for you.  A few manufacturers of this type of product have taken the time to hook up experienced meditators (like zen monks) to encephelographs, then fashion their audios to mimic what is occurring in these deep meditators’ brains.  It would make sense then, to a large degree, that you could experience similar benefits from your brain undergoing this process. 
Brainwave entrainment is clearly NOT an effective standalone treatment for mental illness, but it may be an effective adjunct treatment in certain individuals. It should also be mentioned that when using brainwave entrainment, you may want to have a specific purpose in mind. If your goal is to relax, yet you’re using a protocol that is stimulating, you may falsely conclude that it doesn’t work even though you’re using the wrong protocol.
When I am using equisync I feel kind of like it is “pushing me” – I guess this is the right way to say it- to achieve better results, which I really like. I fall asleep quickly, and sleep all night and even wake up before my alarm goes off. I feel noticeably calm during the workday- which is very helpful for what I do. I really like the warm feeling (my whole body gets really warm during my equisync meditation sessions) and I feel kind of like Im floating while listening. The soothing rainfall is also very nice.
The fastest way to make brainwave entrainment technology work for you on your path of spiritual development is to pull back ever so slightly once you realize you have reached the peak of your nervous system’s capacity to recover from the stimulus. Because your nervous system is like a sine wave, when it is about to go into its valley, you pull back just a little bit, thereby giving your nervous system, energetic system, and hormonal system enough room to pull out all of their recovery powers. This allows you to recover from stimulus more quickly, and then you get past the waning stage and back to the waxing stage, where you can start pouring on the juice a little bit more again.

Although most experts will tell you that people can get through the day without the production of Alpha brainwaves, that doesn’t mean there won’t be any repercussions. For people who have suppressed production of these brainwaves, they can end up developing anxiety disorders and other stress-related diseases, which can lead to the weakening of their immune system.
Brainwave entrainment technology of the FUTURE – today. Brainwave entrainment using binaural beats is a thing of the past. Advanced NeuralSync™ technology uses multiple powerful sound frequencies and energetic augmentation that FORCES your brain to STOP producing defective brainwave patterns and OVERRIDES them to create positive neural feedback instead. As you continue use, your brain re-learns to produce healthy, beneficial and healing brainwaves on its own!
EquiSync’s design is based on the 100’s of studies performed on the effectiveness of brainwave entrainment technology, and 1000’s of studies on the powerful benefits of meditation. If you are interested in better understanding the power of this technology and rapidly expanding field of research, then here is a very abbreviated bibliography, a very small sample of the studies out there:
That all said, we are all different and have our own different limits. So I generally advise that you just be aware of how you are feeling, and if you feel like you are getting a bit fatigued from it, it’s probably time to stop or at least take a break. When listening over long extended periods, I recommend that you keep yourself well-hydrated. Your brain needs a good supply of water to function well, especially if you are studying hard and increasing your brainwave electrical activity.
My question is using the Alpha Isochronic Tones- it says not to use while driving or working. But what about listening while you study? I’m studying for a rather difficult exam and I’m looking for something to use while actually learning/reading the material for focus, concentration & comprehension. Thanks! And are the Alpha tones the best tones for this?
Entrainment is a term originally derived from complex systems theory, and denotes the way that two or more independent, autonomous oscillators with differing rhythms or frequencies, when situated in a context and at a proximity where they can interact for long enough, influence each other mutually, to a degree dependent on coupling force, such that they adjust until both oscillate with the same frequency. Examples include the mechanical entrainment or cyclic synchronization of two electric clothes dryers placed in close proximity, and the biological entrainment evident in the synchronized illumination of fireflies.[13]