i have a pug 407 saloon 54 plate with a standard head unit its this one
http://www.soundmasterscotland.com/s...29a2224e50.jpg
its had a nokia after market Bluetooth kit already installed and when in use the head unit goes to aux mode but i wanting know if i could attach a usb port or ipod dock as im used having mp3 players in my cars and don't want lose the standard head unit i heard there are usb interface devices but i don't know were to start
and want be cheap as possible