Furthermore, there are lots and lots of detailed specifications for text-to-speech that are quite inaccessible in the current Mathematica design.
Also for what it is worth, there are programs to utter mathematics (into XML) CORRECTLY. Fundamentally, one needs only a few lines of code to do "in-order tree traversal" plus a bunch of data e.g. to pronounce Cos as cosine, etc. To do a really bang-up job one should diddle with the speed, volume, and such details as to maybe use SPELLING to pronounce certain variable names.
The current program fails on the in-order tree traversal, apparently.
On the larger issue, of getting kindergarten children to pronounce the numbers from 1 to 10. Uh, do you really need to use a computer? Running Mathematica?