LG PA77U Owner's Manual page 97

Item
AV Sync.
Synchronizes video and audio directly when they do not match.
Adjust
If you set AV Sync. Adjust to ON, you can adjust the sound output
(Projector speakers or SPDIF) to the screen image.
Mode
Projector
Speaker
External
Speaker
Bypass
Sound Option Balance: Adjusts left/right audio balance.
Setting
Description
Adjusts the synchronization of the sound from
the Projector's internal speakers.
The + and - buttons allow the viewer to
synchronize the audio with the video.
Adjusts how the sound is synced to external
speakers, such as an external speaker
connected to the digital audio output port, LG
audio device and headphone.
The + and - buttons allow the viewer to
synchronize the audio with the video.
Outputs broadcasting signals or the audio of an
external device without audio delay. Audio may
be output before video as it takes time to process
video input into the projector.
CUSTOMIZING SETTINGS 97