Volvo S60 Owner's Manual page 171

Fader - Balance front/rear
Set a suitable balance between the front and rear
speakers by pressing out the knob and turning it
to the right (volume of front pair higher) or the
left (volume of rear pair higher). Balance is
normalised in the centre position. Press the
knob back to its original position after setting.
Balance right/left
Set a suitable balance between the by pressing
and pulling out the knob. Turn it to the left or
right. Balance is normalised in the centre
position. Press the knob back to its original
position after setting.
Bass
Set the bass by pressing out the knob and
turning it to the left or right. Bass is normalised
in the centre position. Press the knob back to its
original position after setting.
Treble
Set the treble by pressing and pulling out the
knob then turning it to the left or right. Treble is
normalised in the centre position. Press the
knob back to its original position after setting.
Audio (option)
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