Sorry for bringing up an old post but I had problems similar to what was
described here.

I was able to "fix" the crackling audio issues using the following lines
in daemon.pa:

high-priority = yes
nice-level = -11
realtime-scheduling = yes
default-fragments = 8
default-fragment-size-msec = 10

Note that this instance of PulseAudio was not running on a ubuntu
machine but on a OpenWRT based router (BT HomeHub 5) which is used as a
sink for a ubuntu based machine - however since this post came high in
the list of search results when I searched the crackling audio issue,
there is a possibility that my addition may help somebody.

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https://bugs.launchpad.net/bugs/301755

Title:
  Crackling noise after update to pulseaudio

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