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Have messages read out loud in Messages on Mac
Messages can speak the text in a transcript, the Messages window, or a profile window.
In the Messages app
on your Mac, 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 
, then click Spoken Content. Click the Help button 
for more information.