The JangleBox JB3 is the most outstanding compressor yet - one that gives discerning guitarists the greatest performance and recording versatility available. If compression is a significant component in achieving your sound, then the JB3 will quickly become one of your favorite pedals. You might never turn it off! The JB3 s refinements and upgrades - including dual output, a mute switch and full tone controls on both sides of the compressor - make it indispensable in your rig.