5 are cross sectional views showing further details of the device the device comprises an elongated housing 10 which is preferably constructed in two pieces including a top wall 12 and a relatively flat bottom wall 14 the top wall 12 of the housing has an elongated opening 15 as shown in fig3 for accommodating the keyboard assembly 16 which includes the typical black keys 17 and white keys 18 the top wall 12 of the housing is also provided with another elongated aperture for receiving a control panel plate 20 shown in fig3 and 5 a plurality of switches and indicator lights are mounted upon the panel 20 and are discussed in more detail hereinafter with reference to the electronics of the device it is noted that the control panel plate 20 is tilted relative to the keyboard assembly so as to provide easy reading of the positions of the switches at the end 22 of the housing 10 there is provided a through passage 24 extending between the top and bottom wall surfaces of the housing fig1 shows the player 39 s fingers in phantom extending through the passage 24 for contact with rotatable control knobs 26 also discussed in more detail hereinafter these control knobs 26 such as the one shown in fig5 are easily manipulatable by the player 39 s fingers as the instrument is grasped by the left hand of course the instrument of this invention may also be constructed.