I've been listening to the audio results of the pan command 
and am trying to conclude what it really does. Is there 
anything beyond the obvious shift of image in the stereo 
field? For example: Does it work like a balance control in 
a stereo system (where at either extreme one channel's 
information is silenced) or does it progressively mix/move 
the output of one channel into the other, creating a summed 
output? - Doug Marshall