very interesting. i didn't know those type of programs existed. well, kinda..i have this thing called brainwave generator that "generates tones with binaural beats." a constant tone at 7Hz helps with meditation whereas a tone starting at 12Hz and descending to 3Hz over a period of 20 minutes is supposed to induce sleep (i use that one at night, though i can't verify its usefulness since i always fall asleep anyway
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