A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. More specifically, the electronic keying features may include unique identification keys that may be read or detected by the electronic key identification circuitry to determine whether the components are associated with each other and intended to operate together. The fixed-axis wheels are disposed along a corner edge of a bottom portion of the box portion. The dielectric material includes different dopant concentrations for different fin density areas and is the same material as deposited.