You use it like how you would use any other vsti in the daw of choice. It isn’t a songplayer. You have to send midi note events to it to trigger phrase patterns. You can keymap different phrases across the keyboard and record in the output in the daws piano roll for example. Not behind redux right now to be specific.
I don’t believe redux plays “patterns,” but phrases. It sounds like maybe you’re trying to use redux to play an xrns or mod file inside another daw… if so, redux doesn’t allow for this, as far as I know (having never actually used redux, lol)
What precisely are you trying to do?
I’d recommend diving into phrases and what they can and can’t do. Multiple instances of redux would be quite powerful within another daw, but it’s not the same as renoise in terms of multitrack capabilities