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You cannot use speaker level output to tap into. It is only good with LLC (Line Level Converter) to use with a sub amp. It works one way and not the other - from speaker level to line level.
What you need to find is how the amp is controlled and what kind of input does it take. Where does the volume change - in the amp or the headunit (some hedunits control amp digitally)? Is the input balanced (+/- with a mid point in the ground) or unbalanced (- is the ground)? PC's output is unbalanced.
Get on VW forum and ask them. I'm sure plenty people replaced their headunits and tried to keep the stock amp. Essentially, this is what you're doing.
The remote turn-on is not hard. You can simply connect it to the ACC wire to get you going, provided there is a remote turn-on input on the amp.
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