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Effects processors, also known as audio processors or audio effects, are devices or software used to alter or modify the sound of an audio signal. They work by taking the original audio signal as input and outputting a changed signal. This can include adjusting the frequency response, dynamics, time-based effects such as delays or reverbs, and more. They are used in various applications, including music production, film sound, gaming, and live sound reinforcement. Some examples of effects processors are equalizers, compressors, gates, reverbs, delays, chorus, flanger, and phaser.