Here's the Hutchinson, MN 2001 DC again. Of the 7 DC's in town, this is the only one that sounds the attack signal first, then the alert signal! I like how you can hear the siren click on! At 1:35 in the video you can hear the last rotations of the wind down really well. You can also hear that strange undertone during the alert signal. I am impressed with the sound quality.
http://www.youtube.com/watch?v=mIrEnjPdGEo