So I recently purchased a 23’ VW Tiguan and I plan on building a full system and retain the factory electronics. I’ll be adding a Helix DSP Pro MK2 w/director for signal to my amps. I’m wondering what’s the standard these days? Use the high level input from the factory system to use the Apple CarPlay, Nav and XM then use a lightning digital connection on the helix for better quality? Is there any way to pull a digital signal from the factory? I could use my director for volume control. I know in the glove box there’s a spot to add a cd changer (I’ve been told it’s $1000) and I remember a YouTube vid of a European company pulling a digital signal… anyone know how?