Thanks Mike. I've been looking at the service manual and you're right about the headphone jack, I figured I could test for weird mixer settings by judging the levels being sent from there to the meter on a Logic channel strip. It looks like the 1/4" outs are on the same circuit as the XLR outs after IC62B/A, etc. (I could be wrong) I used 2 different sets of xlr cables. I don't use the mixer, but I checked the panning of my samples in the zones window. I fiddled with the volume pot. I init all params just for giggles, but I have not power cycled the machine because I was working on something.
[Edit] turned the machine off/on, no change. tried the using the 1/4" outputs, they have the same issue: Left channel is -4dbs quieter than the right. I was told it is a $300 fix to ADDA board, so I think I will try to source replacement parts for the left channel, IC, resistors, etc. and see if I can fix it that way. Will probably end up with the 8 analog outs expansion which would be cheaper than getting the board fixed.