At the risk of resurrecting such an old thread, I fitted a Connects2 USB interface (CTAVCUSB003) to our Mk4 FR TDI with the Alana MP3 head unit this weekend. I was supposed to use it in our Lupo, but tried it in the
Ibiza and it's stopping in. At £90 I might get another anyway.
It works fine once you've got to grips with the filing restrictions. Essentially, you can only have six folders (CD01 to CD06) with up to 99 tracks in each folder. Obviously, this presents problems if all your MP3 tracks are filed 01 title, 02 title, etc within a folder for each album as you'll end up with all the track 01s together! A new filing system will need to be created me thinks. The display does not show ID3 info either, just the CD and track numbers.
There is an SD flash card adaptor supplied if you have any spare cards (I tried a 256MB), but I've just ordered a 4GB USB pen drive for it. I tried a Pacific stick MP3 player but it won't have it. Additionally, there is a 3.5mm line in, removal keys, USB and line in extentions.
If I remember, I'll post pics tomorrow. I fitted it in the cubby hole under the head unit to save drilling in the glove box.