See also:

System setup
You can select the following menus only by operating the “TUNE/TRACK/CH” dial. ...

Volume control switch
Press the switch to the “+” side to increase the volume. Press the switch to the “−” side to reduce the volume. A number indicating the volume will be shown on the audio display. ...

How to play back
Press the button and select the “BTA” (type C audio)/“BT Audio” (type D audio) mode. ...