Thanks SteuerwagenSchmiede that's what I suspected. Everything else in your description matches how I've always had PZB. I can make the change to remove the voice - that will be a nice improvement for sure. I've also had a couple of Dutch drivers confirm this in a discord chat - they drive across the border with PZB so they're good sources of information for me too.
This was an example for the incorrectness.
It's correct like your said:
Every time when you hit the acknowledge button it should make this beep noise independent from 1000 hz magnet.
As I said it's correct in the RS1 and Flirt 3.
Ok perfect - thanks for clarifying