NUX Metal Core Deluxe MKII Hi-Gain Distortion Effect Pedal for Guitars and BassesThe NUX METAL CORE DELUXE MKII is a high gain preamp pedal with 3 distinctive high gain amp models including the Duo Rect, Fireman, and VH 4. You can select these models via the 3 way toggle switch. The Duo Rect is based on the Mesa Boogie Dual Rectifier. The familiar 90s American metal sound with the iconic metal front panel that reminds you of countless classic records, from metal to punk to grunge, including Metallica, Tool, Korn, Soundgarden, Foo