#2
My best guess is that he just wired in a super high gain circuit in (possibly with a delay) and that just makes feedback naturally. I would just pm his YouTube.
Quote by Most_Triumphant
Depends, I don't know what pickups go good with plywood. EMGs will make it sound like every other EMG guitar though.

Quote by JazzMunkeyy
it needs a silver flakes
and sara underwood
#3
Look up the Big Muff Feedback Loop mod. I'm willing to bet that the circuit is as similar as the casing they put the pedal in.