In MC_Rack cardiac signals can be automatically detected with the Spike Sorter. The signal rate and the interspike interval (ISI) as parameters that characterize the beating rhythm can be monitored online during the experiment, and can be saved together with the raw data. The export features of the event-based parameter displays allow a direct export of the extracted parameters in universal ASCII format, or as a graphics file.The demo data used as seen in the image on the top was recorded from a cardiomyocyte cell line from mouse that retains a differentiated cardiac myocyte phenotype: HL-1 from Dr. W. Claycomb.