I'm trying to hook up an RME Fireface 800 and Apogee Ensemble to my iMac Core Duo, running Logic. I've connected the two pieces using the ADAT in and out. The Fireface is connected to the computer with a firewire. When I open Logic I can't find the inputs of the Ensemble. All I see is inputs 1-28. I tried all of them and didn't get a signal even though I have a signal on the Ensemble. What am I doing wrong? Thanks.