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:
Basic triangle sample using wooden mallet.Recorded using a Rode NT5 and a Zoom H5.Edited in ocenaudio.It's always nice to hear what projects you use these sounds for.Let me know. ;-)