What version of android on what kind of "car stereo?" What version of Primo/NextGen. What language are you wanting TTS? You first need to make sure TTS is working on android (goggle, pico, vocalizer?) This have nothing to do with TTS for Primo/NextGen. Then you have to find TTS voice file *.zip to put under the voice directory in order for Primo/NextGen to use.
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