I faced this problem a couple of days ago and did some investigation about it, 
here are my conclusions:
1- This bug has nothing to do with ogg or vorbis
2- It only happens when there's no ~/.openalrc(I haven't tried anything with 
/etc/openalrc), creating an empty ~/.openalrc avoids any problem.

I developed a small minimal program with only openal and alut as dependencies 
to reproduce it, here's how to reproduce the bug:
- Make sure you have no ~/.openalrc
- Use play, aplay or paplay to listen to how /usr/share/sounds/login.wav sounds 
when played correctly.
- Run the attached program and you'll hear significant clicks and gaps, in 
addition to the sound being faster than it actually is.
- Create an empty ~/.openalrc by running 'touch ~/.openalrc' and run the 
attached program again, it'll work properly.

The source code uses alut to do initialization and plays
/usr/share/sounds/login.wav by default which I assume to exist on all
Ubuntu variants.

** Attachment added: "A minimal application to reproduce the problem."
   http://launchpadlibrarian.net/17783525/openal_problem.zip

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plays all sounds fragmentary on alsa backend.
https://bugs.launchpad.net/bugs/192573
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