Noise reduction pedals eliminate unwanted hum, hiss, and feedback, particularly useful in high-gain settings. Early designs were basic noise gates, while modern pedals feature advanced frequency filtering. Key models include the Boss NS-2, ISP Decimator II, TC Electronic Sentry, and Electro-Harmonix Silencer. These pedals are vital for metal, rock, and any setup with multiple gain stages or single-coil pickups. They tighten up distorted tones, prevent feedback in live settings, and maintain signal clarity without killing sustain. Proper settings are crucial to avoid over-clamping natural dynamics.