Thanks Steve. If you have the time, will you take a few minutes to try the test on Windows? Not the clean install part, just run tone and listen for a few minutes. I sincerely apologize for asking anyone to listen to tone, but if this is in all our recordings with this hardware, it’s worth it. I’ve opened the same sessions with a Motu box and have made crystal clean recordings.
Like I said, I don’t know if it’s just a Mac issue, but all of my troubleshooting instincts tells me it’s the hardware.