Just got a replacement CAT 100 as the first one almost killed my FOH input in digital distortion. CH volume should be under 50 and still some digital distortion of the kind you REALLY dont want. Gain on mixer set to 0. The distortion does NOT come from the mixer but from the amp. I thought the first amp was broken somehow but this next one is the same. When I set the CH Vol below 50, I get so much noise that the amp is useless which is mu conclusion. Especially after 47 years of playing through all sorts of amps including a bunch of modelling amp... This look the best, but.... useless in a live setting if you want to use the XLR out. Through the amp itself there are no problems.... Welcome back my dear tube amps