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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?

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It is indeed a low-pass filter. You could just try different cut-off frequencies and hear what suits your needs. Keep in mind that the in real life the cut-off frequency will be related to depth. So if you're trying to simulate a sound deep underwater the cut-off frequency will be lower than close to the surface. This article (ogp.org.uk/pubs/406.pdf) contains some interesting info on sound under water. Not knowing your final purpose makes it hard for me to say if it is of any use for you. –  Bart Arondson Nov 18 '12 at 10:58
    
Very helpful, thanks... I'll try with half way between 20 Hz and 20 KHz (the limits of human hearing, as the document states), and then half way between my new value and the above and bellow previous limits... this way of aproximation appears to be very fast and effective –  rraallvv Nov 18 '12 at 22:42
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See also: avp.stackexchange.com/q/1666/1530 –  ObscureRobot Dec 5 '12 at 3:04
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migrated from avp.stackexchange.com Jan 25 at 9:28

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3 Answers

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.

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Mid EQ works aswell. Alot of Metalcore/ Hardcore use this for intro effects.

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Could you elaborate this answer a little bit? Maybe a link or explanation to what you mean by Mid EQ and even better would be a link to a Metalcore intro using the Mid EQ. –  Bart Arondson Dec 5 '12 at 0:25
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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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Thanks, I'll give it a try –  rraallvv Feb 21 '13 at 0:30
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