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:
A binaural dummy head with a pair of DPA 4060 mics installed in the silicone ears of the dummy head was used to record a coffee maker. If you're using this recording, please credit me, Weave of K