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Symphony 2 aux input | Audi-Sport.net
A4 Auxiliary plug? - AudiForums.com
Bluetooth and iPhone/iPod/AUX Kits for Audi A4 S4 2006-2008 – GTA Car Kits
Audi iPod iPhone AUX USB guide A4 2004 2005 2006 « EnfigCarStereo's Blog
Aux/Bluetooth - AudiWorld Forums
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Aux Audio Input for Audi A4 A5 Q5 (B8) 2008 Onwards with Concert or Symphony 3 | eBay
Audizine Forums
Audi A4 2002-2005 install of iPhone, iPod and AUX adapter for Symphony stereo.avi - YouTube
Audizine Forums
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Audi A4 B7: How to Install Auxillary Input and iPod Interface | Audiworld
Audi iPod guide A4 2002 2003 « EnfigCarStereo's Blog
Aux Adapter,Yomikoo Car Audio USB AUX Input Adapter Auxiliary Audio Interface for VWAudi A3 A4 S4 A6 S6 A8 AllRoad TT : Electronics