I was using an old Ivona 2 voice for my in game voice. I made a lexicon for it which said more that .250 and all the averages. That voice is difficult, if not impossible, and did not always prounce thing correctly. I found in the windows directory for windows 11 a folder called Spech_OneCore, Engine, Lexicon, en-US and it was empty. I put my Ivona lexicon in it and now the Windows narrator voices that OOTP Uses will use it and it sounds much better.
If you to try it, you can get it here:
https://www.mediafire.com/folder/lstctl6d1sy8t/TTS
If anyone tried this you found that it did not work.