Abstract: Disclosed herein is a new and unique type of circuit control for an electric guitar. Simply stated, it varies the resonant frequency of the pickup itself in addition to filtering out frequencies which are suppressed or rolled off. The mechanism by which this is brought about includes a potentiometer connected to a center tap of the coil assembly.

Abstract: Disclosed herein is a seated leg press exercise machine comprising a seat which is adjustable on a trackway, a pair of foot platforms associated near the seat to allow one's feet to be placed thereon, a pivotal bar connecting these foot pedals so that horizontal displacement of one extremity of this pivot bar not only swings about an arc caused by the pivot, but is also connected at the extremity remote from the pivot with a linkage which indirectly lifts a pre-selected magnitude of weights. The indirect linkage includes a chain running through series of gears, a shaft fastened to one of the gears, a cam member attached to the shaft, a cable attached to the cam, and weights attached to the cable. Therefore, when the pedals are displaced in a horizontal sense, the linkage follow and react with this motion, and exercise work is done against the weights. Supporting the linkages, weights, seats and foot pedals is a framework.