Volvo V70 Owner's Manual page 184

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
Adjust treble by pressing the knob and turning
it to the left or right. The treble is "normalised"
in the centre position. Press the knob back to its
original position after setting.
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Balance - right/left
Adjust balance by pressing the knob and
turning it left or right.Balance is normalised in
the centre position. Press the knob back to its
original position after setting.
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.
Audio functions HU-650/850
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Selection of sound source
There are two ways to select sound source:
Either with the shortcut keys AM, FM
CD or the SOURCE knob.
Turn the SOURCE knob to select Radio (FM1,
FM2, FM3 or AM1, AM2). This knob can also
be used to select CD or CD changer (option) if
connected.
Press the AM or FM button repeatedly to toggle
between FM1, FM2, FM3 and AM1, AM2.
The selected sound source is shown in the
display.
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