> I've no tips for you as far as conversion other than:
> http://www.gutenberg.org/browse/categories/2 which is a list of
> gutenburg books already converted.
I don't think "conversion" is the correct term. I don't think
any synthetic voice reader can cope with a text pronounced by
a professional human reader. There is a reason, why commercial
audio books are sold, but I have still not seen a software for
this task. Synthetic readers are for disabled, for some special
computer tasks, but not for literature.