The Tour Series Blue Note gives you a very woody blues overdrive feel and can achieve more gain than a typical tube screamer, with more control (no this isn't another TS clone just using this as a reference). This pedal is all about feel and really works well with any guitar/amp combination to heat up a clean tone or boost and sculpt a high gain monster.
Volume: Adjusts signal loudness with large headroom. Turn it up to slam the front end of your amp. Find a sweet spot in the middle to keep it dynamic.
Gain: Adjusts the amount of overdrive in the circuit.
Fat: A Subtle low-end trim. Helps attenuate the differences between the thickness of humbuckers and thinner sound of single coil pickups.
Tone: Adjusts top end and smoothness