Support contacted me and suggested to go ahead and try your recommendation. I'll do that tomorrow, since the car isn't here right now. I actually don't expect things to get better, because it's not exactly noise, but distortion.... Oh well, we'll see tomorrow. Thank you all for helping me out this far!

Edwin de Vaan
mk2 rev.7 # 080000263 (queue 1232) 6+20Gb blue/red