Power switch and volume control
Subaru Legacy / Subaru Legacy Owners Manual / Audio / Power and sound controls / Power switch and volume control

The dial is used for both power (ON/OFF) and volume control. The radio is turned ON and OFF by pressing the dial, and the volume is controlled by turning the dial.
See also:
Behind the Wheel
I believe the greatest obstacle facing Impreza shoppers is the car's power.
The new, smaller engine is less powerful than the previous generation's power
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How to play back
1. Connect a USB storage device / iPod®.
2. Press the “CD/AUX” button. Each time you briefly press the button, the mode changes in the following sequence.
*: Only when a Media Hub is connected.
...
Acc
In this position the electrical accessories
(radio, accessory power outlet, etc.) can
be used. ...
