Side external adjustment from left to right: volume, feedback, gain and fuzz. The pedal has an external input to control the gain with an expression pedal. Also found internally 3 trimpot to adjust the output volume, the adjustment of the level of the external input and the bias of the first transistor. Rather very complete ...

The feedback setting is unusual. It allows to act on the self-oscillation of the fuzz. Beyond half, we quickly get an oscillation sound if we push a little too much gain! It goes in all directions...

The gain setting typically acts on the saturation level. By increasing it, you also boost the dynamics and the bass. The fuzz setting messes up the sound by making it a bit more random. This affects the grain texture of the pedal.

This Strakal Brulu Taol Evezh offers a rather muscular grain overall, round and super dynamic Big Muff type but without the side too fat. It generally retains a good definition except in extreme settings where it is more difficult to control.

The pedal offers a very large reserve of volume and it responds very well to the volume of the guitar. This allows you to find this nice light overdrive by lowering the guitar. 

Technical