Ultra-low noise design, a super classic compressor with attractive clear sound! Compresses excessive input and boosts low input to even out sound levels, creating a sustain effect. Equipped with an equalizer to eliminate muffled sound. Pay attention to the unique compressor sound with a strong attack! *Operation checked, cleaned, and in perfect working order. Currently has Velcro attached to the back. --------------------------------------------------- Thank you very much for viewing this product! Please feel free to ask any questions you may have in the comments.