“Pacemaker” is a portable, professionally designed DJ system of the size of an MP3 player. It is the one and only tool of this kind to date to offer users the possibility of mixing and playing music and putting on musical performances practically anywhere and at the drop of a hat. With a 120 GB hard disk, it is capable of storing thousands of songs, with a sound quality equivalent to that of a CD. A sensitive touchplate makes it possible to control the speed and the bass/ treble balance. This makes the “Pacemaker” a top quality replacement for traditional DJ systems.