One of the coolest filters available in AudioKit is the Moog Ladder.
It's based off of Robert Moog's iconic ladder filter, which was the
first implementation of a voltage - controlled filter used in an
analog synthesizer. As such, it was the first filter that gave the
ability to use voltage control to determine the cutoff frequency of the
filter. As we're dealing with a software implementation, and not an
analog synthesizer, we don't have to worry about dealing with
voltage control directly. However, by using this node, you can
emulate some of the sounds of classic analog synthesizers in your app.