Seymour Duncan SFX-05 Lava Box Distortion Pedal Works splendidly in front of a tube amp with a 3-knob control set that makes it easy to find the sound you're looking for It's very responsive to your guitar's volume controls, making on-the-fly tweaks a breeze without having to adjust the pedal The 6-position Rumble control provides a bass roll-off for fine-tuning to your type of pickups Perfect for all things rock! The Lava Box is not an ordinary Mosfet distortion/overdrive effect pedal It actually reacts more like a great amp than a stompbox, with the depth and dynamics that give well-made amps so much character