When I link the OP-1 to the K.O. via the USB-C to USB-C T.A. cable I get crackling and popping noise.
When I run it into my Komplete Audio 2 II it’s even worse.
If tried other USB-C cables. It’s not the OP-1 Field, it’s originating fro the K.O. C-port 
Frequently connect these 2 over USB for clock, and start stop, OP-1F to ep-133.
Haven’t noticed any noise over here.
Are you passing ep-133 audio over into OP-1F?
Yes. Exactly. I’m running the audio from K.O. output into OPF record, which has no noise.
When I connect USB-C KO to USB-C OP1F I get noise but it is more faint.
If I go USB-C OP1F to USB-C KO it is less… but it is still there.
try a ground loop isolator
either audio or usb