Okay, so after some more research I realize that keystep could after all be placed in the middle of a sync-chain.
Then the midi-chain could be SQ1 -> Kstep -> Mc707-> DT -> DN.

A bit strange really that SQ1 need to be master clock (if it’s going to get along with the rest) but at the same time the BPM/speed knob on the SQ1 makes it impossible to finely adjust to the desired bpm? :rofl: