No increase and decrease sound - just alerts

Discussion in 'OS X El Capitan (10.11)' started by sparkie7, Mar 31, 2017.

  1. sparkie7 macrumors 68010


    Oct 17, 2008
    I have upgraded to El Capitan on Mac Pro 2008 3,1. When I press the sound increase and decrease buttons in the top function row - there is no beeps or sounds like in 10.6.8 that I was running prior.

    When I go to System Preferences > Sound > Sound Effects - the Select an alert sounds all work, but when I slide the Output volume left and right on the slider - there is no sounds/feedback whatsoever.

    I have selected Line In and Line Out for Input & Output respectively.

    Any ideas why there is no volume up and down sounds?

    PS. Also noticed that the Optical Audio out port at the back of the Mac Pro is lit up red - is this normal? and has something to do with the Sound issue?

    Any help appreciated
  2. Ritsuka macrumors 6502a

    Sep 3, 2006
    There is a checkbox below the in the same preferences panel.
  3. sparkie7 thread starter macrumors 68010


    Oct 17, 2008
    Thanks. Found this...

    Go to System Preferences>Sound>Sound Effects, and check mark Play feedback when volume is changed

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