Hey all,
So yesterday we did a gig at a big venue, and when I was done setting up my kemper, I hooked up my guitar, and the kemper squeeled like a dying pig....
I'm not talking guitar feedback here, but a high-pitched interference-like squeeling. It was also doing it wihtout anything connected to the input.
Best of all, we run 3 kempers, and the kemper of the other guitarist did exactly the same thing!
The only solution, luckily, was to set the noise gate to +10, or we wouldn't have been able to play at all. (noise gate is usually set to +2 or +3)
I've done loads and loads of gigs, from small ones with shitty power-lines, to headliner stuff on big stages and not even once did we encounter what happened yesterday.
I'm pretty sure if I power on the kemper now, it will just work fine (as it did two days before during rehearsal).
Could bad mains power cause this behaviour? Or something with the XLR cables going to the FOH? I actually should've removed the XLR cables from the Kemper to see it that was the cause, but we were in a hurry to set up and start the gig.