Thanks for your reply. I'd appreciate it if you would clarify a point that you made.
In a previous post, I said "I don't see why context should affect text-to-speech software like TextAloud (except where it involves a part of speech issue, e.g., "produce" as a verb versus "produce" as a noun)". You've now said that, "a word alone might be pronounced perfectly, but when in a sentence with other words nearby, the voice will try to pronounce it a little differently".
Unlike what I said on this point, you do not qualify your statement with a reference to a word involving different parts of speech that normally affect pronunciation. So, would it be correct to infer that you are saying that a software voice takes context into account when determining pronunciation all the time, for each and every word, regardless of whether the word is one (e.g., "produce") that is normally (i.e., by humans) pronounced two different ways, according to its part of speech status?
And, if so, why? Why wouldn't words whose pronunciation never varies be coded to indicate that, so that the voice software would ignore the context when determining pronunciation?