Abstract: A musical instrument including an electronic organ provided with sound generators of an upper manual, a lower manual, a bass and a rhythm section. The sound generators are connected electrically to control switches in a console, these control switches being actuated by spaced horizontal, arcuately disposed, rows of main, switch actuating, pedals selectively operable by a person's left foot. The main pedals are disposed also in vertical rows corresponding to a basic note of a chord while the horizontal rows correspond to the key of each basic chord. A diode logic, in cooperation with the sound generators and control switches, dictates a prescribed chord of the lower manual sound generator to be sounded when a main pedal is depressed.