I am also experiencing this bug. Playback in Audacity is fast/garbled and 
causes Audacity to crash
external usb soundcard - Behringer UCA202
Ubuntu 15.10
Audacity 2.0.6 from repos or 2.1.2 manually installed

similar to N.J, my terminal is filled with the warning:
ALSA lib pcm.c:7905:(snd_pcm_recover) underrun occurred


(workaround)
open the file ~/.config/pulse/daemon.conf
-
if that file doesn't exist, create it:
cp /etc/pulse/daemon.conf ~/.config/pulse/daemon.conf
-
add this line to the bottom of the file and save it:
default-fragment-size-msec = 2
-
restart pulse:
pulseaudio -k


decreasing the fragment size from the default of 25ms to 2ms probably increases 
the likelihood of stuttering if the system is under load, but I have not 
noticed any problems yet.
The "default-fragments" value also has an influence, some values generate the 
problem and some don't, regardless of the fragment size value. I don't 
experience the error when default-fragments is on the default of 4 so I leave 
it unset.

(references)
https://bbs.archlinux.org/viewtopic.php?id=185736
http://forums.linuxmint.com/viewtopic.php?f=42&t=44862

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https://bugs.launchpad.net/bugs/1460498

Title:
  Unable to play back sound or plays back too fast with Audacity on
  Ubuntu 15.04 with wireless USB Headset

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