Creating phase-shift effects with filters

We all understand how filters work — they allow some frequencies to pass while stopping others and most can generate resonant peaks as well. But it’s a little-known fact that there’s something else going on, too: frequency-dependent phase shifting. It’s part of the sound, but it’s way in the background. On the Virus, you can use overlaid filter curves to exploit this phenomenon, make it more audible than usual, and produce some cool effects with it.
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