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This system for a digital electronic musical instrument imparts various tonal and sound effects, such as vibrato, echo, and reverberation. The system comprises a "digital arithmetic operation unit constructed with a combination of adders, multipliers, delay circuits, etc., a control unit, a parameter memory, and a read-out unit. By control data and parameter data which are respectively read out from the control unit and the parameter memory by means of the read-out unit, switching of the operation mode of the digital arithmetic operation unit is controlled in a time-sharing manner ..."--DWM 4,474,098 43.75.Tv SIGNAL EMITTING DEVICE WITHThis is another storage/playback system for musical melodies in which the time value of each successive musical note (or rest) is selected on keyboard 4, and the frequency of the tone corresponding to each successive