ELECTRONIC MUSICAL INSTRUMENT WITH KEY CODING IN A KEY ADDRESS MEMORY

In an electronic musical instrument, an actuation of a key switch produces a key address code corresponding to the key switch. This key address code is stored in a key address memory. A tone clock pulse corresponding to the key address code is selected from among a plurality of tone clock pulses. A musical tone wave shape memory stores in analog a wave shape to be reproduced. The musical tone wave shape is read from this wave shape memory at a reading rate corresponding to the tone clock thus selected. Attack and decay of the musical tone wave shape envelope are stored in analog in an envelope memory. When the key address code is stored by the actuation of the key switch, a clock pulse is selected to read out the attack wave shape portion at a reading rate corresponding to this clock pulse. When the key switch is cut off, another clock pulse is selected to read out the decay wave shape portion at a reading rate corresponding thereto. The read out output of the envelope memory is applied to the voltage control terminal of the musical tone wave shape memory thereby causing the musical tone wave shape memory to produce from the output thereof a musical tone wave shape with the desired envelope.