I usually just plug my xlr cable into the "left" (output labeled left) on the back of the Kemper. At one recent gig i happened to plug into the output labeled "right" and i was getting a thin tone. I plugged into Left and it went away. Unsure if i just had a bad connection or if you SHOULD be plugging into only the left when you have a single output. I didnt think it mattered but usually used Left.
Curious to hear the answer.
thx