[WIP] Depth charge sound degradation

Historically and realistically speaking, one of the drawbacks (from the Allied ASW point-of-view, anyway! ) of depth charge attacks was that the explosions severely degraded the ability to listen afterwards. It sometimes took up to fifteen minutes before they could clearly hear again.

As we've all noticed and experienced by now, that's not what happens in-game: almost immediately after a depth charge attack warships can hear a U-boat just as clearly and distinctly as they did before the charges went off.

The good news is that I'm working on a way to have a depth charge, after exploding, leave behind a pocket of disturbance just as they really did. The bad news (--cough--cough--) is that I'm a total newbie at playing around with what I need to play with to do this. So don't look for a release anytime real soon. --wry grin--

When I'm done, though (--fingers crossed-) what I intend to have is depth charges leaving behind pockets of disturbance where they have exploded, ones that last between 2-3 minutes (I'd like to have them last longer but I'm afraid that, based upon how the AI works for warships, that the result would be having warships just 'lock onto' those areas and just keep depth charging them over and over again instead of waiting for the noise to clear up a bit before continuing to search). I even have a sound file from WWII of an underwater explosion and the resulting sound disturbance that leaves behind that I intend on associating with the lingering after effects of a depth charge exploding (alas, another 'fun' thing I'm going to have to trial-and-error learn to do).

Wish me luck!

~Albrecht