Okay. That was unexpected, but I actually had a pleasant experience with customs today.
The guy did listen to the story, of how a pedal that's technically my property already, and has been all the time, finds itself in a parcel from a non-EU country addressed to myself.
He then told me that the problem is that I sent off a worthless pedal (because broken) and when Origin repaired it, the pedal gained worth and that this is something that needs to be taxed. Then he went off to talk to someone else.
Now there could have been a good portion of altruism in the people, or it could have been that it might be a nightmare to calculate what the pedal was worth beforehand and what it is worth now and how worth much it gained through the repair - I cannot tell and assume a mix of both - but the guy came out of the office, handed me a form to place my signature on and the DCX bass was mine again, without any further payment.
I took it home and played it. It's still a great pedal and I still really enjoy it.
Furthermore, I decided to do some more plots:
This is all knobs at noon and the party-trick-switch in the FLAT position, just switching from EQ to OD.
While in EQ, it is more or less perfectly flat, the curve in OD seems to favor mids, and then drop off, starting around 3k.
Next, I wanted to look at the LF and HF knobs.
I recorded the pedal in EQ and OD mode, with the gain at noon and the volume in a fixed position, sweeping through the LF and HF knobs.