Panning is not a great solution,
as there may well be STERO clips in the timeline.
changing the panning on these simply reverses the left-right image.
you'd have to go thru your timeline, FIND all the stereo clips, UN-STEREO them, (option L)
then alter the panning.
too hard.
ESPECIALLY if this panning is for a one-off version for a composer, or sound editor or whatever.
while we're on the subject, there is a simpler way to pan a group of clips:
select them all,
Control , = pan left
Control . = pan centre
Control / = pan right
nevertheless the "Audio Outputs" approach is the safest and simplest method in this case, IMO.
nck