Okay, I'm back on Windows 10 and I got help from Behringer and it turned out to be something I did to myself and the chain of events made me believe it was Windows 10. I'll spare you the gory details.
Anyhow, I use a patch bay for channels 7, 8 which has worked fine thus far; however, with a keyboard patched through in stereo to those channels via the patch bay and with the keyboard off, it was generating the horrible USB whine. All I had to do was pull the patch bay cables and the sound immediately went away. I'm feeling a little stupid at the moment for not trying more options than I did.
For the money this is a really nice interface and support was very helpful here. Thanks for patience and help from the crew here. You guys and gals are the best!
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