The quietest studio leveling amplifier around! The Effectrode LA-1A is a high-end, studio-grade vacuum tube compressor in a pedal. Whisper-quiet operation and a wide dynamic range make this tone-tool an unparalleled tone enhancer. Its natural warmth and clarity are simply unmatched! The Leveling Amplifier was developed as a four knob version of the classic Effectrode PC-2A. The LA-1A provides dedicated knobs for Attack & Knee (David Gilmour is known for a modified PC-2A with these knobs). The Attack and Knee knobs influence how the LA-1A compresses the signal: making it subtler and more transparent if needed. The Leveling Amplifier also adds a foot-switchable Boost and some other handy functions. The LA-1A just flat out makes everything sound better! Effectrode LA1A Leveling Amplifier features • High-end, studio-grade tube compressor • Controls: Peak Reduction, Gain, Boost, Attack, Knee • Dynamic EQ switch restores some bite in your tone • True Bypass • Power supply included • Power: 12V DC, center positive • Current Draw: 1000mA • Dimensions: 7.5" X 4.8" X 1.3"