The hum I can't help you with, the only time I get hum is when the gain is too high on one of the other pieces of equipment.
Panning is another story altogether. I just did a new song on the MR8 that originally started out experimenting with getting a fuller sound out of my Ovation A/E. This experiment led to writing a pretty decent tune and recording it in the same day....a new record for me! Anyway, I use a V-Amp...feed it into a mixer and then to the MR8. The V-Amp has left signal wet, right signal dry, so I feed them to different channels so that I can pan and seperate them. I also mic'd the guitar into another channel. I now had 3 inputs which I panned the mic hard left, the V-Amp wet signal hard right, and the dry signal from the V-Amp dead center. I fed tracks 1 and 2 on the MR8 where I counter panned the hard left mic to about 1:00 and the hard right wet signal to about 11:00. This all resulted in a very fat sound....I'm very pleased.
bd