JOYO Dyna Compressor, JF-10 Model for Electric Guitar & Bass, Classic Ross Re-creation, Low Noise, True BypassJOYO 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 has