Sony KP-48V80 Operating Instructions Manual page 29

received.
This is useful when you need to copy down information of the main picture.
Press to freeze the desired scene in the main picture. The frozen picture is displayed
in the window picture while viewing the normal picture in the main picture. The
GUIDE window picture size is automatically changed to 1/4 if it was 1/9 or 1/16.
Press again to resume normal PIP viewing.
SWAP Press to switch the audio and video of the main picture and the window picture.
(under the cover)
Each time you press SWAP, the picture and sound of the two will be exchanged.
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