Aston Martin DB 9 2010 Manual page 155

Steering Wheel Controls
[12] VOLUME- Volume control.
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The auxiliary input socket is provided to connect audio devices
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which can not be connected using the iPod or USB connections.
Only volume control will be available from the vehicle Audio
system. All other functionality will be from the Audio device.
Audio Device Connection
Locate the Auxiliary socket in
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the armrest cubby box. Connect
the audio device to the auxiliary
socket using a suitable cable.
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