Lexus 2004 GX470 Owner's Manual page 331

AUDIO
Each time you push the "Audio" switch, another language
stored on the disc is selected.
The selected audio language will appear on the screen.
Push the "Back" switch to return to the previous screen.
316
(i) Changing audio format
"
1 Controller button 2 Screen switch
DVD audio only —
Push the "Audio" switch on the screen or the "AUDIO"
button on the controller and the changing audio format
screen will appear.
Finish