--Discontinued--The Radial Tank Driver is a unique interface that has been designed to work with most common spring reverbs. As such, the frequency response and tone shaping cannot be viewed in the same manner as one would a typical effect. The frequency response and drive network must be optimized to work within the confines of a spring reverb. Of note will be the high frequency Shimmer and low frequency boom control curves which allow the engineer to color the reverb to better fit the program material.