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:
I tried to get my sister to make some weird noises or animal noises, anything, and all I got was whining. So if anyone wants a sound effect of a girl whining you got one!