The trigger is most likely a normal motronic trigger, it seems like Audi has used it on all cars designed in the 90's. The cam trigger is also likely to be the new type, that means that it has three vanes of different width. This make the engine syncronize sooner then if it had a simple cam trigger.

The cam advance mechanism is two solenoids in each head, they stretch the drive train between the two cams in three different configurations if I'm not mistanken. If this engine has a variable intake as the 40 valve V8 engines the switchover points for cams and intake are interlaced to provide the widest possible register.

There may also be an additional cam position sensor that tell the ecu if the cams aren't in the expected position for that particular rpm. This may cause the ECU to throw a code if you mess with the cam timing.