Something I've tried recently with Audacity is the following: 1. Start with a mono track. 2. run the spectrum analysis to find a peak frequency (e.g. EMG's voice has a lot of energy around 175-200Hz) 3. Duplicate the track and change them to right and left stereo. 4. pitch shift one track to produce...

If I knew I'd tell you... truth be told the fact that's a US Gov building is one I can't prove, it's just what I read on the place where I found the link. Anybody wanna do the research be my guest, I'm too busy moving :P Just zoom out and switch to map view from satellite view. You'll find it's in ...