Your boat sill makes noise even though you are totally 'silent'. It's just a function of the game engine. Elite crew maybe. Rare, but it happens.
I'm not sure how this pertains to your OP though. The actual sound you hear probably has nothing to do with how the game crunches it's numbers. All it knows is that if X happens, it is to play Y sound file.
Example, if you tell the engines to run at full speed, the game knows to play (making this file up) engspd_full.snd file. If you replace the sound file with the 1812 overture, you could have Tchaikovsky playing each time you sprint the boat. The destroyers won't hear it though. They'll still only hear the percentages and 1's and 0's the game engine throws at their detection sub routines.
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Luck is a residue of Design.
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