Waldorf 4-pole

The Waldorf 4-pole is a type of analog synthesizer filter developed by the German company Waldorf Music. It is a four-pole low-pass filter with a 24dB/octave slope. It is known for its warm, smooth sound and its ability to create a wide range of sounds. It has been used by many artists, including Depeche Mode, Nine Inch Nails, and The Prodigy.

The Waldorf 4-pole works by allowing the user to control the cutoff frequency and resonance of the filter. The cutoff frequency determines the frequency range of the sound that will be filtered out, while the resonance determines the amount of emphasis given to the frequencies around the cutoff frequency. The filter also has a drive control, which adds distortion to the sound. Additionally, the filter can be modulated by an external signal, such as an envelope generator or an LFO. This allows the user to create more complex sounds.