Thanks.
Either could have been correct, but the vacuum making it softer is indeed more logical.
Just some extra info: according to Vadis, only the pre 2001 D5's have a waste gate, after that it was dropped. And my vacuumpump has two outputs if I saw it correctly. One leading directly to the governor and he pads, the other leading to what looked like the power brake booster. That connector is way more professional, whereas the output for the governor/pads is simply a hollow tube you slide the rubber vacuum-tube over.
I'll try to make a pic to make sure I'm not mixing it up with an oil-feed-line