my vcds cable and software arrived today and for anyone with vag com and the deleted rear speakers in the 2012 and possibly others, i have located the menu to reactivate the cross fader on the mp3 stereo (tested on my 2010
ibiza).
go to the radio module and
coding, then go to long code helper (it will say there is no data available but dont worry) go to the 3rd bit across and you should see some tick boxes appear, if you have no cross fader you should find that the 2nd box down is ticked, and if you have the cross fader the 3rd box down will be ticked and the 2nd box will be unticked (if this is not what you see then dont touch).
if the above is what you see then take note of the previous setting and then make the adjustment by unticking box 2 and ticking box 3 and save the changes, if you go to the audio settings on the radio you should see the cross fader
this cross fader option in vag com also dissables the rear amplifier so even if you connect speakers without this setting changed you will get no sound.
to make this work you will need to devise a way to either fit the pins in the connector block that plugs into the stereo and then run wiring to the rear speakers to be fitted, or find an adapter that duplicates the wiring from the stereo this might enable you to exploit the terminals if they have the pins in the right place....
Mat.