A guitar sustain based on units such as the MXR DynaComp, providing a wide variety of compression and sustain effects, featuring a uniquely vintage “soft knee” compression curve. This effect is extremely versatile and will help even the beginner guitarist to sound masterful. Used in a plethora of situations for phattening and enhancing the low notes whilst bringing down the harshness of the higher range this is a must have in any effects chain