This is a tricky one, since it was more prominent when you were changing patches. I would suggest, that if it comes back again, to remove the patchbay from the equation to rule that out and go from there. Also, if you have been using unbalanced cables, then try balanced, or vice versa.

I’ve had some weird Gremlins pop up with a few Hosa cables in the past year or two. Been replacing them with other brands since.

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