Hello,
Just got my Keystep Pro connected and updated (FW 1.1.7) and it seems a solid piece. It has an annoying problem though which I guess is a bug.
When manually assigning note to a step, there's always one note active already on the step, even if I clear steps/clear pattern. For instance both track 3+4 have a C-note active on every step and it cannot be deactivated any way. If I assign another note to that step, the extra note also plays. Only way to get rid of these notes is to live record or step record over them but manually assigning notes to steps does not work now because of this.
EDIT: Problem resolved. It seems Overdub defaults itself on, and causes this.