"Brown Sound'. It has an extremely tweakable EQ – from scooped mids to tons of warm mids, all with the turn of 2 knobs. This pedal has 4 knobs — two separate tone controls that act as a sort of parametric EQ, gain and volume. It also has a ‘bright' switch that adds a ton of variety and is very handy when playing a dark sounding amp, as well as another toggle switch that will give you high gain 'Brown Sound' tones. Tone This adjusts the frequency emphasis on the highs. It interacts substantially with the Contour knob and Vint./Modern switch. There are several ways you can approach adjusting the Tone. You could start with it maxes and roll it off until you like the amount of highs, or you could start with it lower and adjust it either direction if you want more or less. Either way, it's a fairly straightforward control, but the interaction with the other tonal adjustment options means you should expect to spend some time getting used to the overall tonal possibilities. Vintage/Modern Switch This control essentially sets the overall voicing of the pedal's frequencies, to be either darker with a classic tonality or brighter and more modern if you'd prefer that. Setting this up first will give you a good 'starting point' for your tone, but it's also useful if you've adjusted everything else and feel the overall tone needs to shift in a larger direction. Contour: This adjusts the frequency emphasis overall. It interacts substantially with the Tone knob, and is affected by the Vint./Modern switch as well. At noon, this knob gives you a balances presentation of the overall frequencies; counterclockwise it becomes very midrange - forward, and clockwise it takes the mids out pretty heavily, contouring the sound for a very 'scooped' tone. A little adjustment goes a long way with this control. The best approach would be to start with the Contour knob at noon, and adjust from there.