Legendary sonic signature of the SL 4000E Authentically reproducing the legendary sonic signature of the SL 4000 E console classic channel strip featured on countless hits of the 80's, the SSL E Series Dynamics Module for 500 Series racks faithfully recreates the crucial components and circuitry that defined the sound of the original channel strips. Features Immortal SSL 4000 Series circuitry Class A VCA replication Expander/Gate Based on classic 611E console channel strip The gain element is an all discrete design, identical to the Class A VCA chip used in the original unit, while a true RMS converter is used in the side chain. Containing additional switching options to defeat the over-easy compression curve, and to use a linear release instead of the more common logarithmic curve. As a result, the SSL E Series Dynamics Module has 3 distinct compression sounds, each with it's own character and flavour.