Weird audio pan behaviour?

Hi all,
I recently noticed that when you add an audio keyframe to an audio track, the pan goes from -1 to 1 all by itself. When I add a second audio keyframe, the pan switches back to -1 and I get a nice diagonal automation line.
Am I having trouble here or shouldn't any parameter stay as it is unless the user decides the change it?
And shouldn't the pan be on 0 by default? Pan equals balance?
Any suggestions?
Thanks

shouldn't the pan be on 0 by default? Pan equals balance?
Not always. That IS the way it is for a mono clip: 0 = center, -1 = left and 1 = right.
But for a stereo clip, the default setting is -1, which means that the left channel will be output left and the right channel will be output right. A setting of 0 means that both channels will be panned center (making the pair mono) and a setting of 1 means that the channels are swapper; left channel is routed right and right channel is routed left.
MONO CLIP PAN SETTINGS:
-1 = left output
0 = center output (default)
1 = right output
STEREO CLIP PAN SETTINGS:
-1 = Channel 1 routed left, Channel 2 routed right (default)
0 = both channels panned center
1 = Channel 1 routed right, Channel 2 routed left
-DH

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