To get the Siren in Hyper Chondriac Music, I used a varient of radio fuzz. Except with stab at 7:00 and comp at 5:00
then I turn the comp left all the way, then turn the stab all the way.
Here's a sample [sorry for poor quality, recorded with crap mic :]
I don't have a delay pedal, so I used Audacity