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Have text messages read out loud
Messages can speak the text in a transcript, the Messages window, or a profile window.
Select a conversation or select text to be read.
Choose Edit > Speech > Start Speaking.
To make the speaking stop, choose Edit > Speech > Stop Speaking.
To change the computer’s speaking voice, choose Apple menu > System Preferences, click Accessibility, then click Speech. Click the Help button 
for more information.
Ask Siri. Say something like: “Read my messages.” Learn more about Siri.
See alsoPlay sound effects