Nice recording - thanks! It has a faster pickup than some of their larger sirens and doesn't drop off on the wind-down like a Screamer. Beats the heck out of a Model 2.
I would love for Sentry to build 8/10 port dual tone sirens instead of their traditional 8/16 and 10/15 models. Just take the 10-port head off a 40V2T and the 8-port head off a 20V2T. Of course, the remaining 15- and 16-port siren heads could also be made into something like this: