I have been hooking up to the EBI 100C Biopotential amp., however, I have not been getting any successful readings. The only reaction I am getting is noise, most likely from movement. I am using 8 unsheielded leads (double electrodes on each side of the thoracic cavity and either side of the neck, just as it has been instructed in the acqusition hardware guide. Do I maybe need a ground lead too as I am not using another biopotential amp. at the same time? Looking for any advice to help me get some actual readings.