OS X Yosemite: Audio pane of Accessibility preferences

Audio pane of Accessibility preferences

Make the screen flash when an alert occurs, and play stereo sound as mono.

To open this pane, 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.

Last Modified: Sep 23, 2015
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