Generate three kinds of beats with program discord (http://discord.sourceforge.net/). The resulting sample is approximately 10 minutes long. The beats range from low delta to low beta. Beta (above 12 Hz) is waking consciousness, alpha (8Hz to 12 Hz) is meditative state, theta (4Hz to 8Hz) is dream state, and delta (0Hz to 4Hz) is deep sleep. There is a 2 minute slide in steps down to the final 8 minutes of constant play. As the title says, there are 20 beats, constant during the last 8 minutes as .5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 9, 10, 12, 16 in Hz. If you have ever had a seizure such as an epileptic seizure, you should not listen to this as it might cause a recurrence because it contains beats in the theta range, reputed to possibly have that effect.
Because there are so many beats in such a broad range, nearly everyone should be able to entrain to some extent with this file. If you entrain at the lower beat frequencies, the effect will be very noticeable. ;-)
Generated at 44100 Hz, 16 bit. Best listened to using headphones in order to get the maximum effect from the beats.
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