OS X Yosemite: 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