See also:

MUTE button (if equipped)
Press this button if you wish to immediately cut the volume to zero. The audio display will show “MUTE”. If you press the button again, the original sound volume will return and “MUTE” turns off. ...

Folder selection (only when connecting USB storage device)
Refer to “Folder selection”. NOTE When an iPod® is connected, you cannot select a folder. ...

Registering (pairing) device
1. Select the “PAIR AUDIO” (type C audio)/“Pair Audio Player” (type D audio) menu. If a device is already registered, “MEMORY FULL” is displayed and the mode changes to the Bluetooth® audio ...