thanks for getting back to me so quickly. my problem is this, 4 of the 7 ports on the back of the s4's are funcional. ports 0 and 3 use banana plugs, and ports 3 and 4 require a converter cable and all of these work. so we now have port 6, port 7, and port 9 that do NOT work. it is the same on both of our s4's, and kind of odd. could there be a setting that is causing this, should i get the 18 channel input device in order to see if we can secure some more functional ports, or should I try to repair the hardware? any other ideas? thanks for your help.
josh