Hey,
I have Kemper Power Rack and I connect it to my 2x12 Harley Benton 8 ohm guitar cab through speaker out. Normally it works out great but yesterday when I played in Performance mode I heard this very weird crackling sound. It sounded almost like delay and/or modulation effects were "broken" and they looped "endlessly" untill i rolled down my guitar volume. It occured mostly just when I had stopped playing and my guitar volume was still on. Sometimes when I play at home (even without effects), I get this increasing noise coming from the amp when I'm not playing anything and the guitar just sits on me with volume still on.
Sure sounds a lot like guitar related issue but I have had zero problems when I play with my POD HD500X.
Any thoughts on this?
Greetings,
Harri