This broad range audio frequency generator creates high precision audio tones. Frequencies can be found in a source like this, or can be dowsed/divined on your own.
Some ways it can be used include:
Listening during meditation. Certain frequencies can have beneficial effects on the brain.
Radionics, Scalar, MWO, and other similar projects that accept an audio input.
Imprinting objects with a frequency using speakers. Eg. Imbue a gift for a loved one with a love frequency.