Cool, Subtle Change in OS X Yosemite – Volume Adjustment
In the days of yore, whenever you adjusted the volume in OS X by using the function keys on the top of the keyboard, the OS would make a noise giving you feedback of the new setting. If you held down the Shift key, you could prevent the sound from playing–that is to say the volume of the system would be adjusted to the new setting without making the popping noise.
Now, in OS X Yosemite, if you adjust the volume without holding down the Shift key, the system doesn’t make a response noise. It does make a response noise, however, if you hold down the Shift key, the operating system makes a feedback noise. It’s still a “poppy” sound, but it’s not the pop that we’ve all come to know and be annoyed with.
So the keyboard shortcuts have changed as has the response.
This is going to take some getting used to.