A gaming device having multiple interacting independently operated symbol generators, such as wheels. The inventive spin valve comprises two ferromagnetic electrode layers, and a non-magnetic conducting layer positioned therebetween. A first-type conductive transistor gate is formed by, completing the formation of the first gate stack and a second-type conductive transistor gate is formed by completing the formation of the second gate stack separately from the formation of the first-type transistor gate. After fitting, the application may generate look-up tables to store values for the spectrum and for its first and second order derivatives, respectively.