Similar problems, I have observed in Ubuntu 14.04, after upgrade to kernel 
3.16, unchanged version of pulseaudio. Perhaps it is connected with a timer, or 
other changes in the kernel, and possibly in snd_usb_audio driver.

Logitech, Inc. Webcam C270, skype test service, audacity, sflphone

Ubuntu 14.04 3.13 kernel all work 
Ubuntu 14.04 3.16  and higher kernel NOT work (high frequency voice, cartoon 
voice) 
Ubuntu 16.04 NOT work (high frequency voice, cartoon voice) .



** Package changed: ubuntu => linux-meta (Ubuntu)

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https://bugs.launchpad.net/bugs/1610293

Title:
  mic cartoon voice

Status in linux-meta package in Ubuntu:
  Incomplete

Bug description:
  I have one sort of typical problem, and one very strange problem, both 
related to the audio. 
  First the typical one, because, clearly, the strange one is the headlining 
act here. 

  Typical kind of problem:  My system keeps changing from audio line
  out, to hdmi out as the default choice, and I have to keep moving it
  back by hand from systemsettings.  It seems to be related to
  squeezelite, but am not sure.

  Strange problem:  After updating to 16.04, my microphone transmits
  only a strange, helium inflected  cartoon voice when I speak.  This
  strange transmission works with arecord or ffmpeg from command line,
  and with skype testing service.  The latter convinces me that it is
  not a recording issue, but really a sound capture issue.  Pulseaudio
  will not allow me to select my external microphone jack, though there
  is a microphone plugged in.  It appears to use my webcam (logitech
  C310) mic.  There was no such problem last week under 14.04.  I cannot
  think of any other tests to perform.  If it were allowed, I would
  upload a short recording of my voice, primarily for your amusement.

  A few details:

  $ lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04

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