Advantages would be that all the Emacs packages are free, and
customizable. In general Emacs packages are good quality and Calc
certainly has a good reputation. I don't know specifically about
Emacs Talk, but I bet it's very customizable.
Calc and DragonDictate certainly work together, except that
DragonDictate correction can cause backspaces that delete part of the
Calc stack. I was just playing with Calc and DragonDictate's text to
speech, and I think it would be impossible to use together. Dragon
didn't read any of the symbols, and I don't know that there's any way
to get DragonDictate to read the symbols, just for starters. Also, I
couldn't have understood the speech without having the numbers right
in front of me. I think you can improve this some by tweaking Dragon's
text to speech init file, but it would have to improve a lot from what
I heard just now.
So you would probably want another text to speech engine -- If you're
interested, you might try posting to one of the Emacs newsgroups and
asking if anyone uses Emacs Talk with Calc.
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