This effort you have made into this cutting edge technology is outstanding.
Yes, cutting edge 1980's technology at it's best.

This is about four generations removed from current voice synthesis technology. You might recall
S.A.M. (Software Automatic Mouth), which was the basis of
MacInTalk. If you play with the demo on that page (decompiled from assembly into C, and then converted into JavaScript!), you can hear the familial resemblance.
Interestingly, the company that put out S.A.M. is still in business as
SoftVoice, Inc., and it was their demo of
Twinkle, Twinkle Little Star that convinced me that while formant synthesis might not create
realistic results, it might be "good enough" for my purposes. Since they've been doing this for the last 30 years, I think their example is probably as good as this technology gets.