and thus only the capacitance change may be utilized in the calculations described below such a material is however not so exact and the structure does not become so thin next in the structure there is the signal electrode pattern 106 of the emfit u00ae film arranged on the upper surface of a plastic film 107 which also can be a printed circuit card in detail this layer is described in fig3 b it should be noted that the signal electrode pattern can have a desired form and the different areas can be rectangular oval or round the signal electrode pattern comprises areas 106 and when pressed the element identifies the pressing by generating a charge impulse under an advantageous arrangement the element is formed into a row 108 comprising several subsequent areas 106 wherein the areas 106 are somewhat narrower than the finger width and which areas are very near each other preferably in the range of 0 5 mm the purpose of this row 108 is to form a sensor matrix that senses the place in the row that has been pressed as well as the movement of the finger along the row the purpose of this is to adjust a desired operation at a certain moment such as the bass frequencies treble frequencies volume etc between every area of the row 108 a resistor is arranged by silk printing or by using a miniature chip resistor 110 and only the outer areas 109 of the row have.