Right now it is not possible to program legato notes using a sequencer, despite the fact that this functionality is described in the manual. It only works when notes have different pitch, but if you try to program the same notes the sequencer will always tie them.
And since we don't have an option to set the Gate to 100% there is always a gap between the chords/notes.
i'm sure it is a little oversight/bug and it could be fixed.
EDIT: Another possible solution is to give us an option to set the gate to 100%