It's a fuzz, it has 2 filters.

It can be rock-y,

it can be (very) synth-y.

First filter is pre fuzz, a variable mid boost with a bell shape. this will help shape the overal character of the fuzz, some settings will yield a very nice octave up.

The second one is a Low-Pass at the end of the signal chain, complete with a resonance control that can scream like your favorite synthesizer. The 2p/4P toggle lets you choose your favorite flavor of filter. 2 pole is like an MS20, more agressive and raw, while the 4 pole is akin to a Moog, warmer and complex. This filter can be either manually controlled, with expression pedal or even with an on-board envelope control. with the fuzz at minimum you can use this pedal as a slightly dirty envelope filter.

The ENV control sets the the amount of envelope control of the filter. at noon, there is no envelope control, turn it right for a positive envelope ('WAH' sound), turn it right for a negative envelope ('awww' sound)

and the SLOW/FAST toggle sets the speed of the envelope.

Use this filter as tone control for the fuzz (with low resonance values, in 2 pole) or go wild with an envelope controlled screamer filter :).

BONUS tips: use it with your favorite Octave pedal for some sweet analog synth tones.

Specs:
- dimensions: 115x68mm
-weight: 450 grams
- Power requirements: 9V 'BOSS' style barrel connector, supports between 9 and 26V, 120mA
-TRS connection for expression pedal: 10K linear pot recommended (we use the Dunlop expression pedals)

Made in Belgium.

CMC Audio Bi-Filter Fuzz BFF