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Change Accessibility Audio preferences on Mac
On your Mac, use the Audio pane of Accessibility System Preferences to make the screen flash when an alert occurs and play stereo sound as mono.
To change these preferences, choose Apple menu 
> System Preferences, click Accessibility, then click Audio.
Flash the screen when an alert sound occurs | Make your screen flash when you receive an alert. |
Test Screen Flash | Demonstrate a screen flash. |
Play stereo audio as mono | Make your Mac play stereo audio tracks as mono audio in the left and right speakers or headphones. |