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I have a fascination with brainwaves and the idea that an external impulse can modify the carrier wave of your EEG. Obviously, this is not far fetched (a fist in your face will affect your behavior as well), but that an appropriate sound, or LEDs blinking at the right frequency, have the ability to systemically affect the working of your brain fascinates me.
Of course, when I looked around for brainwave generators, I found very few useful programs, mainly because the generation of a binaural beat (as they are called), requires the generation of two frequencies. One at, for instance 440 Hz, which is played in the left ear, and one at 444 Hz, which is then played in the right ear. If those two waves were superimposed directly one would here a 4Hz beating. Because the waves are presented individually to each ear, the brain must process the difference (or that is the theory at least) and will thus start working at 4 Hz. Each ear will however hear a single tone, without observing the 4Hz beating. That is also the reason one should use headphones when listening to binaural beats.
Of course, who wants to listen to a pure tone at 440 Hz ? I don't, and I cannot believe that such a dry tone would be the most efficient method to synchronize the brain. Consequently, I made a number of programs that should offer the better brainwave.
But before delving into the details, let's just, for reference, list the frequency ranges we talk about. You very likely find a lot of useful information about the particularities of each specific frequency.
Also, before going to the programs on this site, a warning to Epilepsy sufferers: do not listen to any of the sounds/music produced through these programs or which are on this site. I once received an email from someone who had epilepsy and tried, regardless of the warning, one of the waves. It was quite clear that it messed his brain up to the point of sending aggravated, confused emails.
The first program is a trace generator that, instead of generating one tone (and its secondary), will generate around 20 of them, and that in each psychoacoustic frequency band. On average, it generates 480 tones all tuned to present the same brainwave. To make the noise somewhat palatable a powerlaw is used to modify the intensity of the various frequencies over time.
The second program superimposes a brainwave over existing music. This is done by modifying the sound such that the sum of the left channel and right channel zeros out X times per second (E.g: 4 time per second, or 10 times per second etc).
The program takes three parameters. The first argument is the music you would like to modify. The second argument is the brainwave frequency at the start of the song. The third argument is the brainwave frequency at the end of the song.
Some further thoughts: to synchronize ones brain, one should at least try to relax. There is little point in actively trying to work, while listening to a brainwave. Obviously. What is not that obvious is that multi-sensory perception forces the brain into a high energy (Gamma) mode. So, listening to a brainwave while watching a screensaver might make it more difficult to reach the required state. So, eyes closed, headphones on and let go.