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:
Glass shatters in slow motion. The instance I used it in was to highlight a memory.Created by slowing and picth bending this sound:https://www.freesound.org/people/edhutschek/sounds/214341/EDIT: I see a lot of people are enjoying this sound! If you'd like to donate a dollar or two towards my personal starving artist fund (that's a joke) here is a paypal donation link: http://bit.ly/1pWkx9g