AK is doing the percussion. Using preset drum sounds. I suck at creating percussion via synthesis.
I like the Evolver, but I need to spend a hell of a lot more time with it, because it's a very deep machine. I recently moved it to another place, and now have it hooked up to my Nocvation MIDI controller, and I've made a little template that gives me more immediate control of certain features. The sound of the Evolver is incredible - love the mix of analog and digital OSCs.