Abstract: An electronic keyboard key apparatus to simulate the feel of escapement includes a longitudinally extending key preferably pivotally mounted on a supporting base, a spring apparatus flexibly disposed between the base and the key for resisting depression of the key with a variable resistive force, a latching apparatus to latch the spring apparatus in connection to the base, and an unlatching apparatus to unlatch the spring apparatus from connection to the base with a predetermined amount of resistive force. The latching apparatus may be a magnetic apparatus disposed between the base and the spring apparatus having one of a magnetic element and a magnetically attracted element fixedly connected to the base and the other fixedly connected to the key.

Abstract: A harmony generator for an electronic organ, wherein the identity of played keys of the keyboard(s) is read into a storage device and then operated upon by a data processing device such as a microcomputer, so as to supplement the played note data with additional data designating "fill-in" notes which are to be sounded in addition to those actually played. The data contained in the storage device, as supplemented, is then used to control the transmission of tone generator signals to the audio output system of the organ. In a preferred embodiment of the invention, the criteria used to select fill-in notes cause notes corresponding to the nomenclatures of played notes of the accompaniment keyboard to be sounded as though played in the octave below the lowest note played on the solo keyboard. Other fill-in criteria are also contemplated. The fill-in notes are generated by combining played accompaniment data with masks.