Rattling noise inside body.
I'm in a bit of trouble. Could use some help. A few months ago I had a K&K pure sound mini classic piezo pickup installed in my charango. The guy who installed it sawed off a chunk on the back of the body of the charango to get in there and then glued it back. It was working fine for a while but now I'm hearing this really bad rattling/vibration/buzz noise especially when hitting certain notes. Sounds really bad when the mic is plugged in as it picks up on this rattling. I've flown across the world for a gig and I have a few days to figure something out. I can't tell what the issue is. Did one of the contacts come loose or is it the jack that's possibly come loose? I feel like I'm so screwed cause it's not like a guitar where you can see what's going on inside. I'd have to have someone saw this thing back open to check it out. Any advice or insight into what might be going on would be greatly appreciated