I have only the standard radio cd unit, but what is the USB connector in the arm rest for? Should I be able to plug in a memory stick with mp3s on it because it doesn't seem to work. Also my car has been in the garage twice to get the rattles sorted. Going back in tomorrow for the third time to get a licensed technician to have a look. Keeping vw uk in the loop but should they not fix it this time gonna start pushing for a replacement car. They've had the car longer than I have in the 2 weeks since delivery.