The Grp R24 sequencer synced to a midi clock input that also goes through a Keystep 37 which can transpose the output CV via midi ( around 1.52 mins in, off camera ). Row 2 clocks every 16 notes and its CV is summed with the faster Row 1. Row 3 provides the gates and ratchets in random mode. CV and Gate go to the 2600 synthesizer.