The MXR Dyna Comp (model M-102) is a classic analog compressor effect pedal for electric guitar that’s been a staple on pedalboards since the 1970s. It smooths out volume differences between notes, adds sustain, and can tighten your signal for cleaner rhythm work or more pronounced lead lines. The simple two-knob layout—Output (sets overall level) and Sensitivity (controls how much compression is applied) — makes it easy to dial in a range of tones, from subtle leveling to the iconic “clicky,” percussive clean sound heard on many records. It’s powered by a 9 V battery or an external adapter and is known for its musical character and enduring, road-tested design.