I decided to venture down to the Federal Signal 2001-130 that was recently installed near me. I will attempt to record this siren tomorrow for the monthly test at 1:00 PM but I can't make any guarantees.
http://www.youtube.com/watch?v=31CnaAW5950
EDIT: If you look at the power lever in the video you'll notice that it is turned to the "off" position. Looks like I'm going to have to find another siren to record...
NOTE: There is one cuss word at the end so you may want to turn your volume down/off if someone is around you that may be offended by it.