Unclear what device you're working with? I'll try to keep this simple. For an audio track to induce brainwave entrainment, the Left and right channel must be some number of Hz apart. You can only hear down to about 20 Hz. To entrain to a theta level for instance, you might have the R side at 100 Hz and Left side at 104 Hz. Both of those signals are well within the audio range of 20 - 20K Hz. However, your brain perceives the additive effect of these signales which is a periodic wavefrom with a 4 Hz amplitude modulation. The amp modulation is what coaxes your brain toward 4 Hz activity.




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(it supposively help you with lucid dreaming and stuff 
Cheers.

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