Hello chaps, Any help would be much appreciated..... I've just bought a second hand phat box. I fitted no problem and got it working. When setting it up for my specific head unit, it gives me options of 'A', 'B', 'C', 'D', etc etc. I have a Chorus (the car is a 2002 S3) with cassette. Does anyone know which type this HU is as it doesn't say in the manual. Thanks guys Tony.