The amount by which the panning of a note is shifted with each key.
Positive values mean higher notes are panned more to the right, negative means higher notes are panned more to the left. In most cases, this will be a small value. The note at which this is centered (at which the effect of pan_keytrack is 0) is set using pan_keycenter.
|pan_keytrack||ARIA||float||0||-100 to 100|