The instantly recognizable Drop D hook that launched Papa Roach. Jerry Horton tracked Infest at NRG Recording Studios with producer Jay Baumgardner, who — at DreamWorks' insistence — kept the record raw and 'not over-produced.' The result isn't a scooped Rectifier wall: BOSS describes it as a tighter tone with 'midrange bark that lets every note of the fast-moving riff come through.' It's built around Horton's documented Marshall rig — a JMP-1 preamp into an EL34 power amp, plus a JCM-series head — in Drop D.