hi,i play my minidisc walkman,through my car stereo (audi a3) via the cassette adaptor. this is both unsightly and slightly noisey. is there a way i can make a connection at the rear of the head unit via mini jack plug? is there an adaptor available? in know there is one,if you want to fit a minidisc changer,which is my last resort. i can then run the wire into the glove compartment. any ideas?