Hi Bruce,
Thanks very much for the quick reply

I connected the 1/4" ch2 'unbalanced output' on the rear panel of the unit to the ch2 '1/4" balanced inst/line input', which I was led to believe would auto sense and switch to unbalanced, if necessary. This seems to be the way that both Anthony and basement jack configured theirs.
I understand what you are saying about having the whole mic path wired in for the calibration. But according to
this post the MobilePre doesn't have balanced outputs. So calibrating unbalanced to unbalanced is the best we can do.
As for the graph scaling, I will have to reconnect everything and run through it again, as I didn't save a copy of those details. I will post up my findings later on.
Once again, thanks for the quick response and help so far
Josh