System information
3.  Adjust the Smoothness  slider as necessary to adjust the curve between keyframes.
You can also edit  a keyframe by selecting the keyframe and dragging the pan point in the  track or bus 
surround panner.
Adding keyframes
Double-click in the keyframe  bar to add a keyframe to the timeline. The new keyframe will use the same  
settings and interpolation curve as the previous keyframe.
Deleting keyframes
Right-click a keyframe and  choose Delete  from the shortcut menu.
Moving keyframes
Drag the keyframe to a new  position on the timeline.
Copy keyframes
Hold Ctrl while dragging a  keyframe to copy it.
Change the fade curve between keyframes
If you want to adjust temporal  interpolation—how the pan occurs over time—right-click a keyframe and  
choose a new keyframe type from the shortcut menu.
If you want to adjust the perceived  motion of sound within the sound field, drag the Smoothness  slider to 
adjust the interpolation curve between keyframes. a Smoothness  setting of 0 simulates linear motion from 
one keyframe to the next. Increasing   the setting produces a curved path.
Command Description Looks Like
Linear Panning is interpolated in a linear path.
Fast Panning is interpolated in a fast logarithmic path.
Slow Panning is interpolated in a slow logarithmic path.
Smooth Panning is interpolated along a smooth, natural curve.
Sharp Panning is interpolated along a sharp curve.
Hold No interpolation   will take place. The keyframe's settings will be maintained 
until the  next keyframe.
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