To set Auto Volume

SETTINGS AUDIO Auto Volume

Sets Auto Volume to ON and volume output from channel to channel is automatically adjusted for convenient TV watching when clicking through different channels.
To set AV Sync

SETTINGS AUDIO AV Sync. Adjust

[This feature is available on certain models only.]
Synchronizes unmatched video and audio. Select AV Sync. Adjust to On to synchronize audio output (TV speaker or SPDIF) with the video.
To use Sound Optimizer function

SETTINGS AUDIO Sound Optimizer

[This feature is available on certain models only.]
Allows optimized sound for individual TV installation.