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TextToSpeech (TTS)

I am making an application that reads sentences when I click on them, so I used TTS to read them. the problem is that the voice is not so clear, is there a way to change it or make it read more slowly?

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1) Use the function setSpeechRateto speed up the voice

Speech rate. 1.0 is the normal speech rate, lower values slow down the speech (0.5 is half the normal speech rate), greater values accelerate it (2.0 is twice the normal speech rate).
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