Thank you for the quick response.
Knowing now the behavior of the sequencer I can modify the lines.
But the manual at page 87 ("... We just need to wait for 3 impulses at every step, to alternatively have lines 1,2 and 3 of each of the steps. The functioning is the same on positions “C321”, “C12”, “C13” and “C23”. ...") seems to describe the sequence is going column by column at every step.