Well I googled a bit .. but kept getting distracted by the neck ;)) .. up late watching NZ beat Enland at cricket .. better sleep now ..
Take care my friend
The origin of the syllable OM is lost in the misty past. Its not being specific to any one country or civilization is indicative of its being an universally perceptible sound for the human race. This reason for this universal perceptibility possibly lies in the fact that AAAH is the most natural sound that issues from the human larynx. This is evident when a man cries out naturally in extreme pain, anger or fear. When emotions reach an extreme pitch the articulate sounds evolved by man are not the ones that are heard, but the syllable natural to man which is AAAH.