You said you setup sys pref. Does that mean you see the Audio Device in the Audio MIDI Setup utility? If not then it is not a GB issue and rather a driver or hardware problem.Hope that helps
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Thanks Edgar. I can't find that utility. Not sure I have it installed. I'm recording using "Real Instruments" (GB's term, not mine). Actually I was referring to the System Preferences >> Sound >> Input/Outputs. I set them to look at the USB Audio CODEC. That works.
Actually, this turned out to be elsewhere in the signal chain. I had purchased a studio package from American Musical Supply that included monitors, headphones, audio interface, and a pair of cheap chinese cables that were apparently intended for one use only! Anyway, I swapped out the cables with some old cables I used for performing and found that that was the issue. I could hardly believe that not one but both cables could function one minute, then fail (together!) 4 hours later, but that seems to be the case.
I'm back up and learning how to record. Thanks for the help.