Here is a comparsion with the video I posted eariler. For now I won't say which is which or anything more than this. Can you guess which is which? There is a pretty big difference.
http://www9.zippyshare.com/v/68074414/file.html
http://www.mediafire.com/?nt5be03k83obox8
Virus.wav - 1.5 Mb