Or "kaaaayyyyyyyy ooooooooooooooooohm" if you want to be zazen a thousand times faster!
ducks
Yea, I think a pattern that modulates between two vowels works best, like OoohWaaaOoohm. I think you find this in many religions, for example the call to prayer, but I don't want to be shouting Alla, neighbours will call the police for sure.