A portable electronic device for the production, playing, accompaniment of musical sounds and evaluation of musical skills, comprising means to be associated to an audio system that produces musical sounds, the electronic device comprising: a processing unit (1, 10, 20, 50, 80) which produces musical instrument sounds, the musical instrument sounds being mixed with the musical sounds to produce a single resulting sound, the processing unit comprising a digital signal processor and a microprocessor, the portable electronic device further comprises a jog disk or a pad, wherein the pad is adapted to to simulate the use of the jog disk, wherein the jog disk and the pad comprise a translucent touch-sensitive surface, wherein touch-sensitive sensors are arranged under the translucent touch-sensitive surface of the jog disk or pad, the touch-sensitive sensors being activated by touches of a user to the translucent touch-sensitive surface and generating signals that are processed by the digital signal processor to produce the musical instrument sounds; the touch-sensitive sensors being arranged under the touch-sensitive surface and providing touch-sensitive regions that are sensitive to touches, wherein the translucent touch-sensitive surface is composed of a soft rubber or cushioned material; and LEDs distributed in suitable form under the translucent touch-sensitive surface, the LEDs being controlled by the microprocessor to provide a luminous indication sequence in reference to touches that need to be made in the translucent touch-sensitive surface in order to perform instrumental accompaniment of the musical sounds played by the audio system, the device being configured in such a manner that the luminous indication sequence indicates to the user: a spot of the translucent touch-sensitive surface that should be touched as well as the moment the spot should be touched according to an illuminated region or point in the translucent touch-sensitive surface, and an intensity with which the spot of the translucent touch-sensitive surface should be touched according to the LEDs luminous intensity. a processing unit (1, 10, 20, 50, 80) which produces musical instrument sounds, the musical instrument sounds being mixed with the musical sounds to produce a single resulting sound, the processing unit comprising a digital signal processor and a microprocessor, the portable electronic device further comprises a jog disk or a pad, wherein the pad is adapted to to simulate the use of the jog disk, wherein the jog disk and the pad comprise a translucent touch-sensitive surface, wherein touch-sensitive sensors are arranged under the translucent touch-sensitive surface of the jog disk or pad, the touch-sensitive sensors being activated by touches of a user to the translucent touch-sensitive surface and generating signals that are processed by the digital signal processor to produce the musical instrument sounds; the touch-sensitive sensors being arranged under the touch-sensitive surface and providing touch-sensitive regions that are sensitive to touches, wherein the translucent touch-sensitive surface is composed of a soft rubber or cushioned material; and LEDs distributed in suitable form under the translucent touch-sensitive surface, the LEDs being controlled by the microprocessor to provide a luminous indication sequence in reference to touches that need to be made in the translucent touch-sensitive surface in order to perform instrumental accompaniment of the musical sounds played by the audio system, the device being configured in such a manner that the luminous indication sequence indicates to the user: a spot of the translucent touch-sensitive surface that should be touched as well as the moment the spot should be touched according to an illuminated region or point in the translucent touch-sensitive surface, and an intensity with which the spot of the translucent touch-sensitive surface should be touched according to the LEDs luminous intensity. a spot of the translucent touch-sensitive surface that should be touched as well as the moment the spot should be touched according to an illuminated region or point in the translucent touch-sensitive surface, and an intensity with which the spot of the translucent touch-sensitive surface should be touched according to the LEDs luminous intensity.