Hi David, for general usage like listening to music and watching video
using default installed or new ones seem to be working alright. The
problem is when I use LibreOffice (or OpenOffice.org in Ubuntu 10.04)
Presentation, Impress. The sound effects like for eg. Laser, Apert and
etc set in Effects Option dialogue box did not play properly during
Slide Show.

The sound effects tested (click play icon) in the Effects Option did
produce the correct sound. But during Slide Show (F5), the sound is too
short. Laser sound effect did sound a bit but Apert did not have the
chance to produce any noticable sound.

The same slide show contained WAV file that is very much longer and it
played alright throughout the slide show. The MP4 video also played fine
may be due to the longer duration of playback.

>From my observation, the problem seems to be because of the sound has
not given the time to finish, refering to the sound length (playing
time). May be pulse audio stop the sound too soon for short duration
sound. I can see app icon flashes when the sound being played (very fast
blink) in the sound preference, Applications tab.

I have tried this in many different computers with different Ubuntu
versions. The result is the same for all the computers. Ubuntu versions
10.04, 10.10, 11.04 and 11.10 beta. 10 computers (same hardware) with
10.04, 1 computers with 10.10 and 1 notebook using both 11.04 and 11.10
beta in different hardisk.

OpenOffice,org and LibraOfice used are preinstalled with Ubuntu without
any modification.

The important thing is the problem occur during SLIDE SHOW (F5) in
Impress (Presentation).

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https://bugs.launchpad.net/bugs/846083

Title:
  LibreOffice Impress 3.4.2 - built-in sound effects produce sound to
  short, like being cutoff too soon, making some effect never have the
  chance to produce sound.‏

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