I have discovered that a clean restart solves the playback issue. In a
new session, audio sounds normal, but after using a few applications,
letting the sound play in the background causes the problem to reappear.
Once it reappears, the sound remains 'staticy' until I restart again.

When I don't move the mouse the quality is somewhat better, but when
moving any cursor, the 'burbles' and 'blips' sound much worse.

I only stated logging AFTER the problem appeared in this session. Let me
know if I should want me to log from a clean session, when the problem
appears.

** Attachment added: "Log file from pulseaudio"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/873370/+attachment/2543089/+files/pulseverbose.log

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https://bugs.launchpad.net/bugs/873370

Title:
  [Thinkpad 200772U, Analog Devices AD1981] Sound playback distorted,
  especially when moving cursor with trackpoint, touchpad, or mouse

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