I have an "Audio" button on my player's remote that is used to cycle through all available formats.
I first push the "Display" button to show the current status of what's going on then use the "Audio" button to select Dolby Digital, Dolby True-HD, DTS-HD, etc.
I first push the "Display" button to show the current status of what's going on then use the "Audio" button to select Dolby Digital, Dolby True-HD, DTS-HD, etc.