OK so I have in place my trusty but ancient Grundig RDS5600 with connection to (also trusty but ancient) DAB box. So far so good - I know I need to do some more to sort out the wiring to the rear and sub and I'm going to put in the Parrot kit I got off eBay soon. I know I need an ign feed from the fusebox - or a canbus adapter - but I'm wondering if there's anywhere to take a signal for Speed Controlled volume and illumination? Do I need to get these from the canbus? Also (mine is the non-Bose with rear amp/sub setup) - can I take just the line level signal (common, LR, RR), or does the amp need some extra signals to switch on/off? The pinout on top of the Audi HU shows connections for Can L and Can H which are connected in the 20-pin mini ISO - I assume if they are there they must do something, but I don't have any outputs on my HU that correspond.