ABSTRACT OF THE DISCLOSUREA harmony generator for an electronic organ, wherein theidentity of played keys of the keyboard(s) is read into astorage device and then operated upon by a data processing devicesuch as a microcomputer, so as to supplement the played note datawith additional data designating "fill-in" notes which are to besounded in addition to those actually played. The data containedin the storage device, as supplemented, is then used to controlthe transmission of tone generator signals to the audio outputsystem of the organ. In a preferred embodiment of the invention,the criteria used to select fill-in notes cause notes correspond-ing to the nomenclatures of played notes of the accompanimentkeyboard to be sounded as though played in the octave below thelowest note played on the solo keyboard. Other fill-in criteriaare also contemplated. The fill-in notes are generated bycombining played accompaniment data with masks. The identityof these masks is based upon the nomenclature of the lowest orhighest played note of the solo keyboard. These masks caneither be looked up in a table or generated by a suitablealgorithm. Fill-in notes can be generated simultaneously bymore than one set of criteria, and the fill-in notes so producedcan be separately voiced.
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