Popping noise with Axe-Fx III / Logic Pro X

[JS7]

Hey guys, I'm getting an occasional "pop" sound with the Axe-Fx III connected to my Mac (Logic Pro X) when using it as an audio interface. If I plug the Axe Fx into my Scarlett 18i20 via dual XLR, I don't have the issue. I'd rather keep it connected via USB to avoid running it through the preamps on my interface. Any ideas? Thank you.

 

[touch33]

Just guessing, but perhaps some type of word-clock issue?

 

[mwd]

Eliminate any possibility of static. I kid you not I literally tore racks apart testing cables and trying to figure out why I got intermittent static years ago. I would do some of my jamming early in the morning or late at night. One evening I pulled off my big bear paw fuzzy slippers my sweetheart game me and noticed the static stopped. NO flipping way! Yep... on, static, off, no static.