Add a spider and route from redrum, kong etc to splitter and then from spider to optional ins.
You need to flip to the back of the rack on kickstart 2 to open up the optional in (press cv programmer)(there will be 2 lit up green).
I must admit I use live as my daw but tried it in Reason 11 and could get it to work. Please let me know if you can find a way to connect it to the sidechain for audio triggering in Reason Studio 12 ? (for example a kick over a bass ) Even if i know there are a bunch of different ways to do sidechaining in Reason (i was interested on the mix/ band options with visual monitoring) i would really appreciate to make this plugin work in my daw. In Reason Studio 12 (it works) but to connect it to the sidechain input for audio triggering, i couldn't find a way to make it work properly and even didn't find any informations about it on internet. I've just bought it to give a try and maybe you can help me with that plugin as i saw you were already using it :