The specific benefits and claims from this technology are often disputed and considered scientifically questionable. One problem is that there are few experiments that have utilized brainwave entrainment for the purpose of treating a specific psychological ailment (e.g. insomnia). And the experiments that have been conducted are largely backed by corporations that sell the software; hence it could be speculated that there are conflicts of interest.

One of the more fascinating aspects of what brainwave entrainment does, long-term, is the growing of your mental threshold, and your self-awareness.  I have been a participant of the Holosync Solution for several years, and its maker, Bill Harris, has gone to great lengths to explain why this technology does this.  Much of his research is based on the concept of Entropy and Open Systems, (an idea that nominated its discoverer for a nobel prize).  The brain being an open system, and the technology being a specific type of entropy, this technology has been shown to help the brain reorganize itself at a “higher level” through the growth of new neural pathways. This basically means that 
The two drawbacks: time and money. It takes a full hour everyday for months, and you can drop quite a bit of cash on it (each level costs around $200 for the digital download version and more for the actual CDs). A level takes a minimum of 6 months to complete, so you have to remain dedicated to see the results. Quite an investment, so you'd need to be in it for the long haul. Great support and service, though.
Brainwave Mind Voyages 30 CD Set: Brainwave Meditation Programs, Hemispheric Synchronization, and Brainwave Entrainment Technology (30 BMV CDs: Lucid Dreaming, Astral Trance, Alpha Brainwaves, Theta Brainwaves, Delta Brainwaves, Tones, Astral Vibrations, Remote Viewing, Beta Brainwaves, Lucid Dream Cycle, Lucid Dreams Hypnosis, Guided Dream Incubation, The Whales CD, Rainstorm, The Waters CD, Nature Sounds, Heartbeat Meditation CD, The Om Meditation, Ganzfeld Effect/ White Noise, Breathing Silent Mindfulness, Breathwork Yoga, Tibetan Singing Bowls, Schumann Resonance, Sacred Healing Frequencies Solfeggio Healing Tones, Sacred Geometry, Celestial Sounds, Audio Mind Machine Sessions, Awakened Mind Brainwave Pattern, Float Tank Hypnosis Session, Full Body Mind Massage Hypnosis)
The buyer / downloader of the royalty free brainwave entrainment music / downloads on this site assumes all risks in using the music, waving any claims against the owners of Royalty Free Meditation, its affiliates and its parent company, Spire Audio, for any and all mental or physical injuries. This includes all self-created suggestions for mood altering, brain wave states altering, and for self-improvement or motivation. The buyer/user also agrees to assume liabilities when other persons have access to the Binaural beats or any music / downloads and/or anything it produces, including WAV, MP3, files or CDs, whether for commercial or private use. In no case will Enlightened, its affiliates and its parent company, Spire Audio, be liable for chance, accidental, special, direct or indirect damages resulting from the use or misuse of our music.
Our brains follow cues from outside stimuli, and brainwaves mimic the pulse rates of the sounds we expose it to. So, by creating tracks that pulse sound waves at a desired frequency, we can effectively coax our brain into that state. In layman's terms; by listening to some strange sounding brainwave frequency audios, we can literally slip our brain into a state of feeling calm, alert, focused, energized... and the list goes on. Pretty cool, right!?
When delta waves are present, our awareness of the external world decreases and shuts off. People with ADD have problems with delta waves occurring when they are trying to focus, and focus and attention become increasingly impossible with stronger delta waves. Studies show a reduction of anxiety, improvements in insomnia, and elimination of headaches when people engage in sessions of delta brainwave entrainment.
I have also noticed that during my morning meditation session (I use the product twice daily – once in the morning and again at night), I’m able to almost instantly reach extremely deep levels of relaxation. In fact, within minutes I lose all sensation in my extremities. This is exactly like yogic meditation’s pratyahara, or sense withdrawal, state. It’s really quite remarkable that I could get that relaxed that quickly. This process usually takes me anywhere between a half an hour and an hour and a half. With EquiSync, I reach the same state in literally 2 to 5 minutes!
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The mechanism for this is that when your eyes or ears are exposed to a particular frequency of pulses or beats, the thalamus first distributes this information to the entire brain, including the visual and cerebral cortex where neural activity begins to synchronize to the incoming frequency, producing hemispheric synchronization and a balance of brainwave activity across the brain.
By the 1980s, entrainment technology had merged with advancements in microelectronics technology, making it possible to develop even more sophisticated audio and visual brainwave entrainment products for the marketplace. In the last two decades, a number of scientific studies have reported brainwave entrainment as an effective remedy for ADD, academic learning problems, and improving memory and cognition.
The Transparent Corp forum – This forum is an invaluable resource for any brainwave entrainment user or enthusiast.  Most of the feedback is obviously focused on the Transparent Corp software, but with over 20,000+ posts now you can find answers to the whole array of brainwave entrainment questions on there.  (UPDATE: Sadly, the Transparent Corp forum has now been taken offline)
We’ll use Holosync® to place you in an alpha brain wave pattern, that of focus, concentration, and accelerated learning. You’ll become completely absorbed in whatever you’re reading—or, for that matter, in anything you do requiring focus and concentration. And, you’ll remain refreshed even after hours of concentration. Quietude™ will dramatically increase your productivity and learning ability.
Since it’s humble beginnings, the science of brainwave entrainment has evolved to be one of the most potent and powerful ways to unlock the full potential of the human mind. Our audios have been created by brainwave entrainment engineer, Ashton Aiden, and his years of research, expertise, personal experience, and creativity. We are confident that the audios we offer on this site are of the best quality you will ever find, anywhere.
BrainAscend is a completely free meditation program featuring 5 deepening levels, meaning 5 free MP3 tracks using brainwave entrainment technology, created by Marcus Knudsen, inventor of BlissCoded sound. It uses the scientifically proven most effective brainwave entrainment technology in a special process that steadily expands your brain power and consciousness level.
Cvetkovic D, Simpson D, Cosic I (2006). “Influence of sinusoidally modulated visual stimuli at extremely low frequency range on the human EEG activity“. Conference proceedings : … Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 1: 1311 – 4. doi:10.1109
They are a useful and effective tool that allow you a structured means in which to entrain your brain into a desired, new brainwave state using an intended set frequency range of the audio track. Frequency ranges for desired sleep, recovery and deep meditation states to different/higher frequency ranges for performance “flow-states” and high-level focus and calculation.

How does brainwave entrainment work? Consistent, precisely engineered audio frequencies in the form of binaural beats cause the brain’s frequencies to match the stimulus. Your brain perceives two beats with slightly different frequencies (which are inaudible to the ear) through your headphones. It takes the difference between the two, and matches its own frequency to it. This is called the “frequency following” response.
Brainwave entrainment represents a way of using technology to take our meditation and our spiritual practices into territory that has previously been very difficult, if not impossible, for us to venture into. My inspiration for creating the Profound Meditation Program 3.0 was not about just adding binaural beats or isochronic tones to music, using conventional audio entrainment methods to create brainwave patterns, and say, “Hey, this is the next big thing!” To me, it is all about what we can do—even if it’s pulling from way outside of the box—to enable such a profound coherence that we can go to meditative depths that have been practically out of reach. With the Profound Meditation Program 3.0, I wanted to do something that hadn’t been done before, taking the technology to the next level.
When you embark on this accelerated journey, more than ever you need to understand that brainwave entrainment is a powerful tool, but that your actions, thoughts, and how you use this powerful tool are still strong determining factors in how much you get out of the technology. It’s not just an easy way out. You are going to have to go through a growth and transformational process.
I have never been more creative, productive, more loving to all people nor have I ever been happier in my life. All the wisdom I have found in my pursuit of happiness was somewhere in my intellect. Now it is a part of me. I am using it. I now consider myself a model for younger people to let them see how it is possible to function and be everything they’ve wanted to be. I just celebrated my 85th birthday and I am as young as when I was 25. Thank you for giving me the gift of my true self.

I have read something different about theta waves and learning languages. A University of Washington study tested students resting brainwave activity before learning French. They found that students with a higher amount beta/gamma and a lower amount of delta/theta activity were better at acquiring a second language. When you are dominant in theta, that is the lowest and most deeply relaxed awakened state you can be in. I think it would be much harder to really concentrate, fully understand and learn new information while in a theta state, so I would personally consider using theta while studying.
Brainwave entrainment is a colloquialism for such 'neural entrainment', which is a term used to denote the way in which the aggregate frequency of oscillations produced by the synchronous electrical activity in ensembles of cortical neurons can adjust to synchronize with the periodic vibration of an external stimuli, such as a sustained acoustic frequency perceived as pitch, a regularly repeating pattern of intermittent sounds, perceived as rhythm, or of a regularly rhythmically intermittent flashing light.