It definitely does not mimic prop noise - it simply creates a cloud of bubbles which create a false ASDIC return. In real life, an experienced ASDIC operator would immediately spot the deception as the false return, being static, doesn't exhibit any doppler shift. In game, the decoys will work whatever your speed, it's just that there's little point in using them except when you've already been detected and are making violent evasive manoeuvres.
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