The Cusack More Louder is the tone of your guitar, but More of it, and Louder!
There is a toggle switch to select between True Bypass, and Buffered Bypass. Then just a single "Gain" knob, to select how much boost you have while on.
With the Cusack More Louder in Buffered Bypass mode, you will notice sounds from your guitar that you didn't hear before. Because it's a high impedance buffer, it does not load down your guitars pickups. As a result, you get the full rang out of your pickups. Nothing is lost in the cabling, or by the input of your amp or other effects.