Abstract: The invention relates to an electronic percussion-type musical instrument, such as an electronic piano, capable of producing electronically sounds simulating a piano, harpsichord or other keyboard percussion instrument. The keyboard is multiplexed to produce a serial time division multiplexed data stream having tri-level encoded signals in time slots corresponding to the keys, wherein the encoded signals indicate whether the key is undepressed, partially depressed or fully depressed. The amount of time for the key to travel in its undepressed to its fully depressed state is detected and a binary representation of the key velocity correlated to this timing is stored in a memory for readout synchronized with the scanning of the keyboard. In each time slot, a portion of the percussion envelope for the pertaining key is calculated and generated together with the discrete amplitude levels for the percussion envelope in a digital to analog conversion circuit.

Abstract: A system for use in electronic organs and electronically actuated organs wherein a pattern of notes sounding as if played on the accompaniment or solo manual are played from the pedalboard. The pedalboard is encoded such that depression of a pedal will generate an encoded binary word corresponding to a chord having as its root the note corresponding to the depressed pedal. Individual notes of the chord are played in a rhythmic sequence at a rate determined by the rhythm generator of the organ and in a pattern which can be selected by the organist. As the pattern is being automatically played, the organist is free to manually play a melody on the solo manual and accompaniment chords on the accompaniment manual. The pattern is changed from a major key to a minor key having the same root note by actuating a knee paddle.