To set Auto Volume

SETTINGS AUDIO Auto Volume

Auto Volume to On. Varying volume output from channel to channel is automatically adjusted for convenient TV watching when clicking through different channels.
To synchronize audio and video

SETTINGS AUDIO AV Sync. Adjust

Synchronizes video and audio directly when they do not match.
If you set AV Sync. Adjust to ON, you can adjust the sound output (TV speakers) to the screen image.
To use Sound Optimizer function

SETTINGS AUDIO Sound Optimizer

optimized sound for custom TV installation.
[Depending on model]
DTV Audio Setting

SETTINGS AUDIO DTV Audio Setting

[Depending on model]
When an input signal comprises different audio signals, this function allows you to select the audio type you want.
If set to AUTO, the search order is HE-AAC → Dolby Digital+ → Dolby Digital → MPEG and output is produced in the first Audio Format found.