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What I mean is, not which app/option/button to use to remove a hissing sound, but how does the tool one uses to remove the hiss do that. Does it remove every low-volume noise? Does it break the sound into its components and remove a certain type of sound? etc.

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Well, this depends strongly on the tool. In my opinion, the "easiest" (or at least the most intuitive) way to do it would be to use a filter that would remove the frequency content of the hissing sound. This could of course be done with the use of FFT-IFFT tools, but as already mentioned, this will strongly depend on the tool.

Additionally, it could make a difference if the "profile" of the hissing sound would be available to the tool or it would have to "guess" what a hissing sound is.

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The best way to do it is to first examine a sample of the hiss. This means, you need to find a part where the hiss is the only sound that is being heard. If you have a denoising software, it will create the hiss profile, if not, you have to use a spectrum analyzer and manually check the frequencies that are increasing the most when the hiss is the only sound. Afterwards the denoising software applies a filter which is mostly an equalizer that cuts/reduces those frequencies. It can also be done Manually if the hiss is not too complex or doesn’t get in the way/conflict with many other sounds in the same frequency range. Of course this will also affect the sound as a whole. That’s why a clear source file is always the best.

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