taken from field

The relative "center" of the clip. A pan value of 0.0 plays the clip normally where a -1.0 pan shifts the clip entirely to the left channel and 1.0 shifts entirely to the right channel. Unlike balance this setting mixes both channels so neither channel loses data. Setting pan on a mono clip has the same effect as setting balance, but with a much higher cost in CPU overhead so this is not recommended for mono clips.