The Fieldbus Standards: History and Structures

An electronic musical instrument includes a tone signal generator whose operation is controlled by active electronic signal processing. The instrument includes both tone effect control means to provide an alternating current control signal to the tone signal generator and manually operable tone frequency control means having selectively variable resistance and selectively variable capacitance characteristics, with one of these characteristics being variable among logarithmically spaced increments and the other characteristic being variable among linearly spaced increments.