I am having difficulty getting Logic Pro X (or my computer, for that matter) to recognize my Eleven Rack as an audio interface. I have downloaded the latest driver from AVID, which appeared to be successful, but when I go into Audio preferences, Eleven Rack is not listed as a choice for input or output. It is connected via USB to my iMac. I have restarted the computer several times with Eleven Rack both off and on, with no luck. Any suggestions? Thanks.