See also:

Activating HDC
Press the button; the LED above the button lights up. ...

My Info
Selecting additional functions Additional functions are available when a message is selected: ...

Multi-channel playback, surround
Setting multi-channel playback, surround 1. "CD/Multimedia", "Radio" or "Settings" 2. "Tone" 3. "Surround" Surround When surround is activate ...