The MXR design team took a classic recording studio fixture and stuffed it into a pedalboard-friendly box. The MXR studio compressor features attack, release, ratio, input, and output controls So you can fine-tune your compression level-from subtle to squashing-right on stage with visual feedback from a bright LED gain-reduction status meter. Constant headroom technology provides tons of headroom for clear, transparent performance that's as dynamic as you need it to be. It's all packed into a durable, lightweight aluminum-housing that's the size of a Phase 90.