SSM2018 is a trimless voltage controlled operational amplifier for gain core symmetry and offset. Complementary gain outputs. The SSM2018T represents the continuing evolution of the frey operational voltage controlled element (OVCE) topology that permits flexibility in the design of high performance volume control systems. The SSM2018T offers voltage output and is laser-trimmed for gain core symmetry and offset. As a result, the SSM2018T is the first professional audio quality VCA to offer trimless operation.