This technique, this is just awesome. I used to do this same technique during my meditational journey a year back to induce a divine calm over my mind, and start my evolutionary process. Yes, it is much easier to concentrate on a tone, than a visual image. Also concentrating on AUM, or OM can lead to interesting states of mind. Also, concentrating on the tone during the day can lead to interesting senses as well. I hope this helps all of you, because this definitely has helped me on a variety of levels. I know this technique will help me, just because I have studied the brain, and the steps leading up to consciousness and dreaming, and have conversed with yogis, and they actually use a technique just like this to help focus. Namaste
brother, which tone??