running multiple sound apps at one time introduces noise
(fizzling/buzz). [I use the PPA for ubuntu-audio-dev due to bug #537448]

Chromium and totem played the same .flv file (go to youtube, play a video in 
chromium (http://www.youtube.com/watch?v=l1Vbs84MziY&feature=related) and play 
the temporary file corresponding to that ( /tmp/Flash*) in totem):
* totem plays it as mono
* chromium plays in stereo
* Starting totem (along side chromium) introduces noise, stopping totem 
restores clarity to chromium's playback (I am not talking about sounds 
overlapping, this is white noise) -- the streams appear to be interleaved and 
correspondingly tempo is halved -- and girl sounds like a guy etc.
* Stopping playback in chromium does not restore full clarity, totem still has 
residual noise but tempo appears to be restored
* closing chromium and restarting totem restores clarity to totem playback.

* if totem plays first and chromium starts after, all symptoms are
inverted except that stopping playback in totem fully restores
chromium's playback clarity.

pavucontrol says chromium uses ALSA playback whereas totem is reported
as using Playback stream.

-- 
Changing left/right balance in sound-preferences changes the output volume 
slider
https://bugs.launchpad.net/bugs/532095
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