However, one may simply try this for oneself and see what results. That is the best test anyway. Bear in mind that specific vowels are not set in concrete for each area of the body. We are individuals and we are in a constant state of change. Another reason to always “feel” what is resonating for you today. Tomorrow may be different.

But generally, the idea is to form all the vowel sound combinations while changing the shape of one’s mouth and throat. Generally the lower tones come from a more open pathway for the air, and higher tones (into the falsetto voice) are formed by more constrictive passage ways. For a good set of references on this I’d suggest researching vocal training, either for singers or for speach therapy.

For example, go to the upper and lower extreme. Try making a super deep “EEEE” sound, then try making a super deep “OH” or “OOOOO” (as in ‘you’) sound. Then try the reverse, making a falsetto “EEEE” and “OH” sounds. Most persons find it easy to distinguish a difference between the two. To some degree this is body mechanics, and in that sense we are all human and share many similar traits. I believe this to be at the root of why most systems suggest OHs and OOOs for the lower tones and EEEs, NNNNs, and MMMMs for the higher tones.

Once familar with this one might try adding additional tones, often called overtones, by opening the nasal passage at the same time. Or by “yawning through your ears.” Soft tones are used — use you “inside” voice

I tend to think of this as “inward directed.” I do not “tone” while trying to project my voice to the back of a large theater. I am projecting my toning into my own body. This can be a very low sound level as much of it seems to be carried by the bone conduction.

And has been mentioned, breath from the belly — if the belly button is raising and falling as you breath you are breathing deeply. If only the chest is rising/falling you are most likely breathing shallowly.

After getting the basics, it is a matter of feeling where the various tones vibrate in your own body, on that occasion. Try to find out how low in your body you can sense of mutual vibration, as well as how high in your head, and points in between.

Common suggestions follow the basic energy chakra centers…. these start at the bottom of the spine, and follow the length of the spine and then up through the head. Usually 5 or 7 chakras are specifically identified.

Base of spine.
Just below the belly button.
Between the belly button and heart.
The heart.
The throat.
The forehead.
The top of the head.

But some systems combine the lower two centers into one, as well as combining the upper two centers. Which one uses isn’t all that important, I don’t think. Use what you find resonates with you — that is the point after all, to find a means of resonating your personal energy within your own body.

Neil

The sound sequence also seems to arise naturally as the mouth opens up – toning from a deep OOOH up to an EEE these sounds are all part of the sequence which forms, sounding like an elongated “WHY”. As I do this I can feel the sound moving up my body.

Best Wishes, Neil