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:
Raw sampled ieframe.exe on a hungarian Windows 7 64-bit computer using Audacity. The reason why it's only 11khz in frequency range is becaue 44 100 hz makes the sample too high pitched.