Joyo'S Jf-10 Dynamic Compressor Pedal Is A True Bypass, Low Noise Re-Creation Of JOYO Dyna Compressor guitar effect pedal features a re-creation of the classic-ross's compressor with very low noise, an essential part of your tone. Use the "Sustain" "Attack" and "Level" knobs to find your ideal tone. Tweak the "Attack" knob to boost your bottom end and level off high-output pickups. True Bypass provide transparent tone to keep the best tone quality, aluminium-alloy housing classic stoving varnish finish, stable and strong. JOYO is over decade of brand reputation, with the most popular budget pedals, amplifiers, wireless systems, controllers, metronomes, tuners winning the love of global guitarists and inspiring people's music dreams. Before playing, please make sure the guitar is fully connected with the pedal. in order to make JOYO pedals work properly and avoiding unexpected noise, we recommend you to purchase an extra JOYO original power adapter, or choose the other reliable brands and make sure it meets the working current requirement of single pedal.