What's the importance? In the Arbans method it talks about using the syllable tu. Claude Gordon also commented on that saying tee is a better syllable, and that tu tends to "pull the sound down and make it dull". I've always been told you should never want an "eeee" sound. It should always be round and full, think "OH". I'm also starting to notice that syllables have to do with more than just sound. It seems when I use "toh" it draws the corners of the mouth more down and inwards. "Ta" seems to pull the corners further outwards and down, kind of like a "bulldog" facial expression. While "tee" seems to hold the corners more firmly in place. Any thoughts on this?