I was also having a sound issue with Karmic as my host and Windows7
running in Virtualbox 3.0.4 and the newer version 3.0.10.  My sound was
choppy and slow.  I confirmed that the problem is unique to Karmic
because I connected to the same virtual machine from Jaunty - I have a
multiboot machine.

I found that the symptoms go away when I run PulseAudio Volume Control
(pavucontrol).  See the discussion and my posting (efffourthirty) on the
VirtualBox forum
(http://forums.virtualbox.org/viewtopic.php?f=7&t=23982&start=15) for
this issue.

Now that I run pavucontrol, the cpu usage for pulseaudio and pavucontrol
have increased to use between 1-10% CPU - even at idle.

-- 
Audio plays at slow speed
https://bugs.launchpad.net/bugs/441745
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