spooky2
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Hi PM, let's say you want to create a HemiSync frequency of 7 Hz; you then would chose two audible frequencies with a difference of 7Hz, let's say 700 Hz for the one, 707 Hz for the other side. Now what I've heard is, in the beginning it can be measured that a brain get's pretty active, responding to the 7Hz; after a while (as far as I remember it can begin after some 10 seconds, maybe 30 seconds) it calms down, as if it's not "interested" anymore. This is the case with many other perceptions also, what stays more or less the same, is "vanishing" into the background. To keep the brain tuned into the desired frequency, you can change the carrier frequencies, so in our example you could change them into, just for example, 1000 Hz and 1007 Hz. Which carrier frequencies to choose, and what role harmonics/chords do play in this whole process, is another question, I don't know much about this. But the carrier-frequencies should not be set too low (under I guess 80 Hz) or too high (above I guess 1000 Hz). (Only my guesses)
Spooky
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