When i observe the activity of the brain in beats per sec i learn that every state has a different frequency.
For example, i can distinguish between the active, focused, clear, trance and thoughtless state. Between the fight/flight fearfull or happy state. By controlling the frequency i can influence these state of being.

The most effective, long lasting, cheap way to accomplish this, is awareness. Methods, devices, books and teachers are not necessary at all.

For those in a hurry there are technical means. It is possible to train the brain with devices.

When we stimulate the senses at a certain frequency the brain will follow. This can be done by sounds, lights and currents.

On
[link to web-us.com]
and
[link to www.skyhero.com]
you can read about the theory.
[link to www.mindmodulations.com]
is about the history.

We use the software program brainwave-generator, to generate binaural beats. You can download this for free at
[link to www.bwgen.com.]

This is what [link to nl.wikipedia.org]
has to say.
On [link to www.lunarsight.com]
you can find a list with frequencies

What you need is a computer and a headphone, this you can expand with light-goggles. The cicuit to make you own goggles you can find at
[link to www.bwgen.com]
With BwGen you can also make wave-files, convertable to mp3.

There is also something called cranial-elektro-stimulation (CES).
On
[link to www.hackcanada.com]
you can find simple circuits to make your own, for only a few euros.

On
[link to www.cerebrex.com]
they show you how to utilize a pingpong ball to meditate.

The video's:
Intro to Binaural Beats
[link to www.youtube.com]
Binaural beats information!
[link to www.youtube.com]
Messages from Everywhere!
[link to www.youtube.com]
What are binaural beats?
[link to www.youtube.com]
About: Brain-Sync / Hemi-Sync Audio
[link to www.youtube.com]
Bill Harris lecture on meditation
[link to www.youtube.com]