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:
Multiple takes of dropping a metal lid from a container onto a wood floor. Some takes have a nice rattle as the lid vibrates after impact.Recorded using an AKG C414 B-ULS microphone into a John Hardy M-1 preamp into Pro Tools.