Hey Brian,
I just ran into this same problem. Channels on my JB3 have reversed. First time was last fri the 11 of Feb at the STS9 show at the HOB in CHicago. And the same thing happened tonight while recording some drums in my basement. I've never had this problem before, been running the JB3 for about 9 months. Yet the first time it happened was the first time I used a AD 500E with my rig. I just used it tonight for the second time and it happened again. Maybe the AD500E and the JB3 do not mix? Before I was running a AD20 behind it with no problems. BTW both times it happend while I was recording, pushed pause, and then resumed. Before the pause, levels were correct, after the pause, swapped. Any advise would be helpful.
Thanx for the great site
-Charlie Barlow