A Resonant bandpass filter/frequency boost with control over Mix, Level and Frequency. From clean un affected signal to fully frequency boost. Adding some clean signal into the mix allows you definition with chords. With the mix set to max allows a very strong peaking effect such as a strong wah or filter effect... Great before a fuzz for a strong or mild wah type effect or feeding an amp or pedal for a stronger midrange or high end. The toggle switch selects between two different modes. A full mode and a thinner mode which dials in the amount of peaked frequency. When used with chords you can cop those small amp and hollow "honk" tones.