Second Hand. Mint Condition. It's both a treble boost and a full-range boost. The treble boost pumps treble and upper mid frequencies like a vintage Treble Boost pedal. In full-range mode it enhances all frequencies and is a great way to kick a slightly overdriven amp into heavy drive. A gain knob varies the overall gain from mellow to full rip and a tone knob lets you tweak the EQ. Features a true bypass for unaltered tone when not activated.