I was wondering something about your build OP. So you have the Sony head unit behind the tablet with an external mic running up the steering column. My question is, how are you able to answer a call when it comes in? If the Sony head unit is behind the tablet, you wouldn't be able to hit the pick up button. Or are you using the call answer button on the steering wheel to achieve this? Im am wondering because I am in the process of changing my set up for one like this, but I do not have steering wheel controls on my Jetta.