I've been working on this app that uses browser speech synthesis, which is primitive but better than it was. On Linux, the app sounds off, but in the ballpark. I just tried it on my wife's Mac, and
it sounds freaky.
Part of the problem was that it pronounces ALL CAPS words as individual letters. I was able to fix that. But a lot of it is that the voice is blatantly strange. That last "dooooo" is so weird!