On the MNM, the ENSEMBLE machines can make chords, and you can p-lock note/chord changes per step, if you wish. I think it’s important to use the FILTER and EQ settings on chords to scoop out the mid range frequencies, so you get that dub by hollow chord sound. Set the ATTACK and DECAY to be really short so it becomes a chord stab.
The MNM reverb is pretty weak. If you want the best reverb you have to get a stomp box like the Eventide SPACE, which is expensive, but makes anything you run through it sound absolutely amazing. Worth ever dollar in my opinion. A lush reverb and delay are essential to the Dub sound. In general, running the MNM through external effects will make its sound really come alive.