Yesterday I had a recording session and I couldn't use my KPA because of noise problems. I used a cleanish profile and added the stomp box compressor. The noise sounded like a grounding problem but I am quite sure it is not the grounding. The cables are good and it is not the typcal single coil noise. I also tried it with humbuckers - no improvements. Firmware is the latest, but the one before did the same.
I know that a compressor can add (or enhance) noise. But it shouldn't be that bad. Also without compressor there is noise. It seems that there is to much unwanted noise in all presets. I am in thailand, and I know that the electricty supply is not the same as in Germany for instance. The studio is top notch professional. So what can i do? Any suggestions?