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Is there a commonly accepted filtering process to make sounds appear as if they are recorded underwater
It could be a generic low-pass/band-pass filter?
What cutoff frecuencies could I use?
Low frequency oscillators modulating pitch, amplitude, filter/resonance amount, or combinations of these would produce an underwater effect. This could be done as a direct effect or in combination with a vocoder.
Mid EQ works aswell. Alot of Metalcore/ Hardcore use this for intro effects.
Another option could be to add a chorus effect to your filtering, this often blurs the sound slightly and extreme chorusing can give the slight gargling effect associated with the "underwater" effect
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