Constant Electrical noise in Audition -- anybody know what this is?

I just set up our ProSonus AudioBox USB96 on our new MacStudio (finally!) and was aboout to record a mukltitrack session in Audition when I heard this background noise. Did a test record, it's definitely there.  I have hearf this kind of thing when a cell phone was close, or electrical cords crossed mic cables -- no wires are crossed.  -- but I moved the cell phone away, and it's still there.    I hear it in my headphones before record. Mystery, of the aggravating kind.

Any thoughts from you gurus?

Thanks

rob

 Model Name: Mac Studio. Running Mac OS Monterey  Version 12.4

  Model Identifier: Mac13,1

  Chip: Apple M1 Max