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 recording of a wasp harassing the left and right spaced mics. Buzzzzz on the right, then buzzzzz on the left. Credit me, Weave of K if you're using this recording. Thanks and enjoy.