So was gigging last night, running in stereo (also stereo in-ears for fun). I noticed that one 'side' was slightly louder than the other, this was confirmed by visual gain levels on the desk, next to me. The really bizarre bit was in the trouble shooting between sets....
1. Switched L and R cables between my delay and reverb pedals in the effects loop. NO CHANGE.
2. Switched the 2 cables going back into the Kemper (from delay in effects loop). NO CHANGE.
3. Switched the XLRs at the kemper end. NO CHANGE....
at this point you'd be thinking it's the desk right?..
4. Switched those same XLR cables at the desk end - and the louder L side switched sides with the quieter R side, so the R was now louder
Repeated multiple times, totally baffled, as was the sound guy. Same kemper, desk and exact same cables was fine the night before. Mental. For the whole 2nd set, the R side was now louder as a result of switching xlrs at the desk end, changed them mid-way through second set at the kemper end and it made no difference, still louder in R