A simple volume pedal. Literally a volume control pot mounted in a foot pedal. So you can have no volume on the initial pick stroke but then hear the notes played. Allows a guitar player to mimic instruments that don’t have such a big initial attack.
That was awesome! He makes playing look so easy. And that part at the beginning about finger-picking was great. I spent quite a bit of time yesterday trying to recreate it. Not so easy for this guy.