On GotSound.org we are using wavesurfer.js to play sounds in a browser.
It's works only in modern browsers supporting Web Audio.
MediaElement fallback to support old browsers like Internet Explorer not always works.
You can find more information about browser supported Web Audio API here.
Please, consider to upgrade your browes to one of the following:
This was an experiment in audacity with some sounds I downloaded from this site. The initial idea was to build an electrical malfunction explosion, but I ended up with this. Credits: http://www.freesound.org/people/ztrees1/sounds/134937/ http://www.freesound.org/people/CosmicEmbers/sounds/160688/ http://www.freesound.org/people/Selector/sounds/250200/ http://www.freesound.org/people/felix.blume/sounds/251401/ http://www.freesound.org/people/Freed/sounds/8411/ http://www.freesound.org/people/Freed/sounds/9469/ http://www.freesound.org/people/Freed/sounds/8427/