Noise is related to million things. Demon works with propeller noise, and that should depend on power which propeller transfers onto the water. Accelerating boat will make more noise, boat steady at high speed too.
There is also water flow noise which depend on speed only, but that is quite uniform noise with no modulation which DEMON could analyze.
DW uses most simple simulations, even so many people find it too difficult (not on this forum I hope !).
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