I asked this question on SuperUser, but it's fallen on deaf ears. Hopefully I can get more of an audience here.
I'm looking for a low cost (or Free) solution like ScriptVox only with a better engine. That is, to read in a script and assign characters to voice. I've read the post here but even with those I'd have to concatenate wav files. It's not that I don't love Audacity, but it is time consuming. I am halfway thinking of writing my own, but I'm sure there has to be a solution out there. Any suggestions?
If having the program access internet is acceptable, then you could use iSpeech.
You can use their API, but unfortunately it is limited to 200 uses/day.
Their API also allows appending format=(wav|mp3) following a query, allowing you to get your sound in both desired formats.