The NCH Tone Generator
http://educate-yourself.org/nchtonegen.html
If your computer has a sound card, this NCH audio tone generator
Download;
http://www.nch.com.au/action/
can play audio tones through your computer speakers or earphones.
You can set the frequency from 1 hz to 20,000 hz.
Certain specific tone frequencies can modify and improve all kinds of health conditions.
It's called Sound Therapy.
Bio-Energetic Frequency Charts
Frequency Chart I
http://educate-yourself.org/Freqchart1.html
Frequency Chart II
http://educate-yourself.org/Freqchart2.html
