Hi!
you can find info about jumpers position here:
https://doepfer.de/a100_man/A160_2_jumper.pdf
However the Doepfer site say this: so far the custom mode is not yet implemented and for future firmware versions a custom mode is planned that can be selected by means of two unused jumpers (probably inverted gate output mode or inverted trigger output mode)

-- Amenbreak

Thanks for the link, that's exactly why I have opened this thread.

I have tested the custom mode of my brand new clock divider using LED pin jacks and it looks to me they all light up and down as inverted triggers indeed, so I was wondering if someone else knew how to move the jumpers around to get something more useful out of that setting...