Michael plays some folk-rock guitar, using his playing dynamics to control reverb amount via the FX Mix Blend of UniFX.
Guitar going into Injectr, Injector's Envelope Follower's Gate is being fed to an ADR which is shaping UniFX's Wet/Dry blend. Playing softly will yield a clean signal whereas digging in will open the UniFX letting the Skylar Shimmer Reverb through. Experiment and set to taste.
Toggling the mode switch allows for dialing in feedback with the FX Mix knob