Housed in a beautiful powder coated Blue 16ga. steel enclosure, the first channel is the "Overdrive Mode" capable of Clean Boost or non-compressed overdrive (using Pull Comp-Cut "up" position) or choose light to medium softer Overdrives (Comp-Cut "down") all while retaining your guitar's original tone. The Tone knob is a very effective Presence control that can smooth out or add upper harmonics.. There's also a footswitchable second channel "Boost Mode" with its own separate Distortion control for medium to higher gains with a more singing violin-like sustain! This pedal gets its natural sound through the use of Asymmetrical Clipping and fulltone's own "Feedback Loop" circuit... a way of creating distortion high in even ordered harmonics like a Class A tube amp! True Bypass w/ LED is standard equipment. "Vintage" for those old mid-heavy, thick mid-'90's FD2 tones that the Ebayers pay too much for. "FM" stands for "flat-mids" offering a more natural sound but I've enhanced this mode for even more transparency, it sounds like God on a strat's Neck Pickup, truly spectacular! . "CompCut" feature has been relocated from the volume Pot to the 3-way mini-toggle switch so you won't accidentally kick it while on stage