Holosync uses binaural beats in their CD products as do many other brainwave entrainment companies (some also use monaural beats and isochronic tones etc.). So maybe the question can be more along the lines of whether binaural beats are dangerous.
Holosync uses very low binaural beats delta and sub delta frequencies in their CD's. The frequencies are embedded into the sound of rain, and if you have good stereo headphones you can hear the binaural beats behind the rain sounds.
I would say it is more dangerous to listen to Gamma frequencies then it is to listen to delta or even theta or alpha frequencies. But it may very from person to person.
For example, if you have ADD or suffer from sluggishness and are always tired or "spaced out", delta frequencies may not be the best choice for you to listen to (you might benefit from beta sessions).
I personally don't think Holosync is dangerous in and of itself.
If you take time to listen to Holosync daily, and therefore train your mind to relax and become one-pointed, naturally you may start to experience sub conscious emotions coming to the surface (depending upon whether you have repressed a lot of emotions during your life).
The same thing can happen if you have the patience to stare at a candle every day at a set time, or meditate on a saced word every day, or chant, or focus on your breath etc. Brainwave entrainment with binaural beats etc. also gives the mind a point of focus.
The fact that emotions come to the surface when the mind starts to become still does not mean any of these methods are dangerous.
But everyone is wired differently. So perhaps here and there brainwave entrainment is not the best choice for everyone.
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