Try this:

  1. open gnome-volume-control and gnome-alsamixer
  2. in gnome-volume-control, drag the Output volume slider to 0 (but don't 
mute)
  3. start playing some audio in another application
  4. slowly start dragging the Output volume slider up, and watch the Master 
and PCM sliders in gnome-alsamixer

What you will see is for about the first 10% of the Output volume
slider, the PCM slider goes up. No sound can be heard when this is
happening. Once the PCM hits maximum, the Master starts to increase.
Only at this point will you start to hear sound.

The problem is at this point the volume goes from nothing to loud
instantly. There is no gradient.

The workaround, as mentioned above, is to use alsamixer instead of the
volume control.

-- 
gnome-volume-control slider moves both Master and PCM
https://bugs.launchpad.net/bugs/573661
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