Well, it turns out that it was the thin film that they put on the outside of the control cavity cover when it's new.
???
I know, I know, you're all thinking I'm crazy.
I took it down to Club Bass here in Toronto where I purchased it and Dave pugged it in and had a look, then amazed flipped it over and smiled. It seems he'd run into this problem before. Pulled the film off and presto.
I've tried it here back at work and it seems that the problem is solved.
I guess the click/clack/pop noise was never really loud and the only time it happened was when I was up dancing around (usually with a full band). I brought my full rig into my work photo studio, turned it up and danced around and that's why it was the first time I heard it (I always sit down in my home recording studio).
Well there you have it.
