Check out this nice video I found of what looks like some kind of Federal abortion sounding for a test in Cooleemee, NC. This video is made even better by the Diaphram horn blasting away for the cycle as well! A truely classic and awesome sound... the only thing bad was that he didn't photograph the horn(s) at all so we can't see what they are. What a great video though!!
http://myspacetv.com/index.cfm?fuseacti ... d=10079918