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Does anyone know of a good text to voice convertor?

I have a lot of pdf files to read for studying/work. I listen to my ipod on the train (but cant read on a the train as I get motion sickness) so was thinking of finding a way to convert my text files to audio so I could make use of that travel time. I know that their are online convertors that do that, but I would rather find a stand alone software of app. Any ideas?

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