“When you plugged in a guitar it would overdrive like crazy – it was incredible!” How a Radio Shack pedal and a fiery Fall Out Boy guest spot helped Filth is Eternal live up to their name

Filth Is Eternal guitarist Brian McClelland plays guitar onstage.

As the founding guitarist of Seattle-based punk group Filth is Eternal, Brian McClelland has been diming up max-impact chord crustiness across the band’s catalog, most recently for their third LP, Impossible World.

He’s also launching his second boutique stompbox, a tone-intensifying five-band EQ dubbed the FILTH EQ+ pedal, which both he and Fall Out Boy guitarist Joe Trohman are juicing on the new album’s furiously d-beating So Below.