Its a flash file as far as I know, so what you can do is right click on the page, go down to view page info in the right click menu ( make sure you click on the page, not the actual soundboard ). Then go to the media tab and scroll down until you find the swf embedded file. Its also likely that you're gonna have embedded swf's from google or other ad services, ignore those. The one you want should be listed under a similar url to the one in your browsers address bar.