Yikes, I lost my sound!

[Jeffrey Needle]

I'm using the Wubi install of Ubuntu, Gnome desktop.  For reasons
completely mystifying to me, I no longer get any sound through the
speakers.  I rebooted to Windows and the sound works fine, so I know
everything is plugged in correctly.  I've looked around for some way I
may have muted the Linux system, but can't find anything.  Any ideas?
Thanks.
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Jeffrey Needle
jeff.needle at gmail.com