I got the v0.4 pcb-s and soldered the parts and it works!
Everything now works as it should, all the voltages are matching as they should (previous version had some offsets).
Now the only thing left is to finish the firmware (and find two 100 ohm resistor somewhere).
Also the knobs are a bit large, so I'm looking for alternatives on ebay to replace them so the scale on the pcb is more visible.