If this doesn't convince you to buy an audio recorder then I don't know what will. Skip to 0:30 for the action, the first 30 seconds are just distant Hamilton Co T-128s.
sirens are not just for danger in fact, they weren't invented for warning you, they were first made (in the 1860s) for music. Japan depicts that. Search *Japan's: Yamaha Music Siren* .
Nice video! That ambience has to be one of the most epic I’ve heard in awhile! Did you buy one of those Sony recorders? I have one and it works wonders for sure...it can pick up sirens pretty clear from a couple miles away no problem.