For many modularists, the filter is the go-to tool for sound-shaping on the fly, which is why so many filters have an oversized knob for the cutoff. In essence a filter is a module that takes incoming audio and removes a controllable portion of theYou will see other types such as band pass, which allows a specific frequency range to pass through. You may also see state variable, a filter that encompasses these different filter types in one unit.
