It’s not much but here it goes.
That’s what System 16 needs (from the manual):
Jack tip to pin #5
Jack ring to pin #4
Jack sleeve (earth/ground) to DIN pin #2
That’s what I have (the adapters for Arturia Beatstep Pro and Ericasynth Drum Sequencer):
Jack tip to pin #4
Jack ring to pin #5
Jack sleeve (earth/ground) to DIN pin #2
I’m not sure how to make sure the adapter is the right one except plugging it into the sequencer. Well, soldering is another way. Guess, I have to do it.
Extracurricular reading: