holy ****ing feedback, batman! have you all heard this ****!!!???

somebody please tell me how to get badass feedback like that, and how to control it so well. do you think they just have some kind of feedback track on a loop or something? i know some amps that i've played thru fed back a lot, naturally, but my current set up is nice and clean. i dont want to change my set up, itd be cool if i could build or tweak a pedal or something to add feedback, mix it wet/dry, etc. ideas?