A processor that cuts frequencies above (low-pass), below (high-pass), or around a cutoff point, used to add movement and tension to a mix.
A filter sweeps a frequency cutoff point across the audio spectrum, progressively removing either the highs (low-pass) or the lows (high-pass) as the cutoff is turned. It is one of the most common real-time controls on a DJ mixer and on hardware effects units.
Why it matters
Sweeping a low-pass filter down on an outgoing track removes presence and energy gradually, making room for the incoming track without a hard cut. A rising high-pass on a build-up increases tension by stripping bass before the drop.
