The Studio Electronics 5089 Filter is a classic analog filter designed by Studio Electronics. It is a 4-pole low-pass filter with a 24dB/octave slope. It is based on the classic Moog ladder filter design and is capable of producing a wide range of sounds from smooth and mellow to aggressive and distorted. It has a resonance control that can be used to create self-oscillation and a frequency control that allows for precise tuning. It also has a dedicated envelope follower and an external input for processing external audio signals. Artists such as Aphex Twin, Nine Inch Nails, and The Prodigy have used the 5089 Filter in their music.