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i know some software that you can type the text and it can read what you say with different voices.
now, there is a circuit from Holtek, HT8950 wich is a voice modulator. i dont know about the availability, but it has a robot function. the datasheet, wich i have but don't know where from, contains a lot of schematic examples.
anyway, if you PM me with your email i'll send it to you.