New comer

[Hamid Vasheghani Farahani]

Hi all. It's a day or so that I've started to use unbuntu linux. I reside in Iran. Here nobody knows much about linux. I have one first question. Can we change the voice of unbuntu. I don't mean to change the language from english to something else, or changing the person's voice. I want to change the orca tts, from one manufacturer to another. and please somebody tell me of tested screen readers on unbuntu. And what is the name of the tts that orca uses by default? Note that I'm still using the live cd of ubuntu. So not a first question, my first three questions.
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