Abstract: A multispeed ECG magnetic tape scanning device for processing and observing in a relatively short interval of time large quantities of ECG signals from two pairs of ECG leads. The information from the two pairs of leads is provided simultaneously on a single oscilloscope tube as one trace above the other, either in real time or at a high speed multiple as a superimposed ECG presentation, or superimposed on each other so as to provide superimposition of the already superimposed ECG signals. An arrhythmia bar graph is also represented on the CRT tube. The playback is in real time, or at multiple high speed playback speeds of 30, 60 and 120 times real time. The playback amplifiers have specific amplitude and frequency responses which are logically switched upon the selection of a particular playback speed to provide accuracy in the reproduced ECG information.