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To specify text-to-speech settings for your device, go to Settings and then Accessibility and then Text-to-speech output.

The following settings are available

Preferred engine: The default text-to-speech engine choices vary by device. Options can include Google's Text-to-speech engine, the device manufacturer's engine, and any third-party text-to-speech engines that you've downloaded from the Google Play Store. Engine settings: To change the settings for your selected text-to-speech engine, select Settings next to the name of your preferred engine. Speech rate: Select the speed at which text is spoken. Pitch: Make the speech pitch higher or lower. Reset speech rate and Reset speech pitch: If you adjust the speech rate or pitch, use these controls to reset to the original rate. Listen to an example: Select this option to hear a short demonstration of speech synthesis.