OS X El Capitan: Change your computer’s voice
You can change the voice your Mac uses to speak text in a window or an alert message.
Choose a voice
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Choose Apple menu > System Preferences, click Dictation & Speech, then click Text to Speech.
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Click the System Voice pop-up menu, then choose a voice.
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To adjust how fast the voice speaks, drag the Speaking Rate slider.
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Click Play to test the voice and speaking rate.
Add a new voice
You can add voices to the System Voice pop-up menu. If you add a voice that’s not on your Mac, it’s automatically downloaded from Apple.
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Choose Apple menu > System Preferences, click Dictation & Speech, then click Text to Speech.
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Click the System Voice pop-up menu, then choose Customize.
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Select the checkbox beside the voices you want to add.
To find a voice, enter its name, country, or language in the search field.
To sample a voice, select it, then click Play.
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Click OK.
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Click the System Voice pop-up menu, then choose the voice.
The voice appears in the menu when the download is complete.
Delete a downloaded voice
You can delete a voice that you downloaded to your Mac.
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Choose Apple menu > System Preferences, click Dictation & Speech, then click Text to Speech.
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Click the System Voice pop-up menu, then choose Customize.
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Deselect the checkbox beside the voice you want to delete.
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Click OK, then click Delete.