Ok this bug might fall into two separate parts 
1. A recent update set to zero and muted all channels, and the Sound 
Preferences of pulseaudio were unable to unmute them
2. Zeimusu didn't rtfm for alsamixer. :-(

To clarify. By using alsamixer correctly (The 'm' key to toggle muting,
the arrow keys to change levels) I could regain sound. Part 2 is now
fixed. This still leaves part 1

I suspect that tevoran is seeing the same couple of bugs, but
alsamixergui has a more easily discoverable method of unmuting.

-- 
I don´t have sound anymore after an update.
https://bugs.launchpad.net/bugs/482178
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