How to change sound volume in gnome-shell?

["Mr. Wang Long" <mr.wang.long@gmail.com>]

Hi,

In gnome 2.28 I used to change sound volume by the mixer_applet, which
won't run in gnome-shell environment. In gnome-shell I have to launch
kmix manually, which shows up in the system tray. But what is the
"normal" way to control sound volume in gnome-shell?

Thanks
Wang Long