I experience similar sound glitches with Jaunty. Rhythmbox, Totem and
especially flashplugin_nonfree (when playing Flash videos in Firefox)
are affected. The notification sound in pidgin creates that rasping
sound too. This sound bug sometimes makes the application crash.

Sometimes when I play a video, there is only this clicking/rasping sound and 
the video is playing like in slow motion. I noticed a similar effect after 
pausing a video for a longer time. I then have to restart Totem multiple times 
to make it play the video properly again. There is sometimes also an error 
message: "Failed to connect stream: Invalid argument".  This error appears 
sometimes when I fast-forward a video in Totem or a song in Rhythmbox. I 
attached the Totem debug messages.
Since I experienced bug 320875 ("alsa-util.c: snd_pcm_avail_update() returned a 
value that is exceptionally large:") until it was fixed and the fix is only a 
temporary workaround, the real cause may be the same.

** Attachment added: "totem.txt"
   http://launchpadlibrarian.net/24160071/totem.txt

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Crackling / scratching noise using Pulseaudio
https://bugs.launchpad.net/bugs/345627
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