There is no such thing, as -5Hz.
Sound is vibrations in the air, and we can't go under no vibrations. That's like making something colder, than sub-zero.
But about BrainWave Generator, it's secure. It also works by the way, like the anti-headache thing, I found that very useful, same with the falling asleep one. I don't use the falling asleep one anymore, though, since it takes like 30 minutes.
You can also make your own tracks. So that, you start at 13, and go to 3(Hz) and then add some of your own music to it.
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