Quote Originally Posted by a01020304 View Post
How can I make it say the letter "A" pronounced "A" and not pronounced "I"(eye)

Its not just A666 it mis-prnounces it does it will all A roads
Unfortunately you can't !!!
Your problem is too complicated. not only in TTS you use, but and in other languages TTS has some bugs...
As you understand TTS works fine, for example the word : " Kate" it speeks the letter " a " as "a" and not as " i " .
But as I said to you previous there are some bugs because TTS speaks not alone such if you have in your PC.
TTS in iGO read to many things, lua files from iGO, lua files from TTS Pro voices, read map (and if the map has some errors?)...

If you want to get deeper to voices then you must try to modify the file lexicon....., but I think you can not modify.

So to make the long story short ,
you can keep Loquendo TTS with all the qualifications he has and some errors that yo can fix them and some that you will never can fix ,
or Try Nuance- has better pronounciation.