Description of problem:

There is no way to change the volume of an application that only plays sounds
for very short period of time.  e.g. Pidgin makes a sound each time an IM comes
in or goes out, but you can't change the volume of Pidgin in pavucontrol since
the sliders disappear from it too quickly when the sound finishes.

Version-Release number of selected component (if applicable):
0.9.6-1.fc9

How reproducible:
always

Steps to Reproduce:
1. open pavucontrol to the Playback tab
2. watch when any app plays a sound
3. the playback stream appears, then disappears too quickly to make use of the
sliders