Text-to-Speech

i downloaded e-book opens using adobe digital editions. need e-book read dyslexic daughter computer using text-to-speech application on mac (version 10.4.10; 1.83 ghz intel core). text-to-speech dosen't seem supported adobe digital editions. missing something? never have downloaded book if thought text-to-speech wouldn't work. people out there learning disabilities why create product downloads e-books doesn't allow computer read them?
any up-grades in future?

i wanted text-to-speech (tts) capabilities read e-books. don't know if true on mac, on pc adobe reader v6.0 allows tts without digital additions add-on. use tts capabilities adobe e-books or other pdf files.

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