Changes the panning of a currently playing sound. This controller may be continually triggered to smoothly move a sound across the sound field or to have a sound follow the player.

Required parameters:

- channel = chan_no (int)
  Specifies the channel number of the sound to pan.
- pan = p OR abspan = p (int)
  These parameters cannot both be specified at the same time. p determines the sound offset in pixels from the player (in the case of pan) or from the center of the screen (in the case of abspan). See PlaySnd for a description of the panning parameters.

Optional parameters:

- none

Example:

`none`