the piano sound signals are then amplified by means of a preamplifier 31 and distributed to two headphones outputs 3 in a specific version of this embodiment synthesizer 30 can be designed so as to reproduce the tones of several instruments the electric keyboard of the present invention typically has neither speakers nor sound amplifier circuits in order to reduce its overall dimensions and weight the provision of two headphones sockets will enable a trainee and a teacher to listen at the same time a right left stereo effect is achieved by means of two progressive ramp filters 32 one filter softens the treble for the left channel thus giving priority to the bass the other one on the contrary reduces the bass thus giving priority to the treble for the right channel this simple and inexpensive device helps produce the spatial sound effect of a piano a pedal socket 5 may be used to connect a pair of pedals 6 to the electronic keyboard the effect of pedal operation is rendered through action on the preamplifier the right pedal being used to extend a sound and the left pedal being used to soften it the electronic keyboard of the present invention may include an interface 26 for external memory devices such as disks 27 microcassettes 28 or plug in memory modules 29 as illustrated in fig1 these devices can be purchased later and can store scores a piano training method etc as shown in fig1 another embodiment of the invention can integrate a screen 8 for displaying useful information to the user such as the scrolling of a score as shown in fig1 screen 8 is controlled by microprocessor 23 and is connected to memory 25 and to hardwired logic circuit 22 so.