OP-1 Field and TX-6 user here.
Anybody getting USB noise when both USB cables are in use?
I started to get some noise out of nowhere and assumed it was the mixer - however it turned out to be whenever I have both hooked up to USB at the same time (Apple Mac).
The ground function on the Mixer slightly reduces it but does not eliminate the noise. I f I pull out either one of the Mixer USB or the OP-1F USB and it’s silent again.
I have only really just noticed it since I just started using the OP-1 Field USB for MIDI. My current solution is to unplug the Mixer USB since im using the main analogue output into my audio interface but it’s a little annoying as I like to have everything plugged in. I have tried diff USB ports and it seems to make little difference.
Would a hub with isolated ports solve this? I think I need one anyhow to expand my ports
Is battery charge turned off on TX-6?
Not sure if this helps - the 1.4.5 OP-1F update introduced unacceptable usb noise in my setup. Reverting to 1.4.2 cleared things up.
Yes - tried that
Update - seems to be the OP-1F for sure
Update 2 - think both cause noise but OP-1F a lot more. Pain as no other MIDI input
I am still on 1.4.2
Will try the opposite and update to 1.4.5 haha
Edit: 1.4.5 - same I would say
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Crappy, just throwing it out there. USB noise issues are always a paint to troubleshoot. Good luck 
I’ve had issues with MacBook USB ports before - I think it was due to the unibody weirdly enough.
Have you tried cutting that out of the equation to rule it out? It sounds like it could be a grounding issue of some kind either way but I’m not familiar with the TE stuff specifically.
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Good point. This is on my Mac Studio but will test on Macbook later when back home. Guess I should try unplugging other USB devices also
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May I ask what you guys are running approx the main Mixer level at and OP-1F main Vol knob. Come to the conclusion im running things prob too hot regardless of the USB noise
An audio isolator will solve this problem. It will be cheaper than a usb one. TE sells one but you can find them much cheaper elsewhere: https://teenage.engineering/store/ground-loop-noise-isolator