I read in one review of SH4 that the reviewer heard the escorts switch from low frequency to high frequency pinging. Was he imagining it? I've never had that happen to me.
I also get a bit hazy on the whole pinging thing. As far as I know active pinging is from supersonic projectors, but is it actually audible in the submarine, or can only the sonar operator manning the supersonic receiver hear it? It's so common in films for the whole crew to be able to hear it, but you never know if that just for dramatic effect (or perhaps played through the sonar set speaker).
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