Special BMW iPod cable needed?

[Big Yellow]

Hi,

I just got my new 2008 X5 and I choose to get the USB interface with it. Now, I just connected the iPod with the Apple USB cable it comes with, and I have some issues like:
- It does not find or recognise any Playlists (I've tried several iPods)
- The song titles are often distorted, sometimes only random letters comes up on the screen.

I understand there is a BMW iPod cable that plugs into both the USB and the AUX connector, and my question is if I need that to get the full benefit of the ipod in the car?

Big Yellow