Look at Sayzme from
http://sayzme.sourceforge.net.
It's a free (open source) text reader that will automatically read anything in the clipboard.
You can easily set a button to copy text in your talking book to the clipboard and use a button to speak it out.
We've been investigating it's use for creating our talking books in school. The added complication is that our books need to be switch /overlay board accessible and the text needs to be symbol supported.
But both are not too difficult with Opus.
Using text to speech does cut down the time and effort involved in creating accessible talking books; recording all those sound files, saving them under funny names and then losing them.
The quality of the voices although not up to the latest natural voices is generally ok. You cannot obviously use the text highlighting facility with text to speech, but there was a program I saw the other day demonstrated by Inclusive technology that allowed you to save synthesised speech as a wav file, which you could then use text highlighting on.
Perhaps it has posibilities but it does seem a long way round.
One thing I can't get Opus to do is to launch sayzeme from the start, I have to manually lauch it first (although I suppose it could easily be put into a run file -though not by me. I tend run a mile from anything like real programming that includes curly brackets, colons and odd squiggles)
Richard Walter