I think you can repro this crash only once in every install, so I did it
using the Feisty LiveCD.

Steps I did to reproduce this crash:

1. Open Volume Control (only Master and PCM are shown).
2. Go to Edit -> Preferences and enable all tracks (Master, PCM, LFE, IEC958, 
IEC958 Capture, Capture, Capture Mux, Input Source).
3. In Playback tab, change Master volume to max, PCM to near min, LFE to max 
and unmute LFE (using the toggle button).
4. In Recording tab, change Capture volume to some medium level and toggle 
audio recording to Mic.
5. Go to Switches tab (just look but don't touch anything), and do the same for 
Options tab.
6. Go back to Playback tab, change Capture Mux to some medium level and then 
mute it (using the toggle button).
7. Close Volume Control (using the X in the corner).

That's all. I know these are a lot of steps, and I think the important
one is step 6, but i did a LOT of reboots trying to isolate this
problem. May be I'll keep trying later.

-- 
[apport] gnome-volume-control crashed with SIGSEGV in 
g_type_class_meta_marshal() 
https://bugs.launchpad.net/bugs/82077
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