The volume knob: everything and the appointment. If you push a little volume, that allows dynamic adds and heavy sound.
The gain knob: Moves a soft crunch / fuzz creamy and subtle boundaries to a strong and aggressive distortion + ..
Sharpness button: allows to control the level of low frequency distortion of the floor of the pedal. mediums fare + / - boosted.
pre-gain control: allows to act on the input MOSFET. More it is pushed and the tone is warm with a distortion + elevated. Notes are also balanced + amplitude.
brightness control: allows to adjust the sound on the mpli which is connected to the pedal (+ / - bright or dark)
This pedal is very subtle in its settings. You can get a sound with a drive just creamy and dark, but also amazing crunch.
As it grows its entrenchment in the small hi-gain, it boasts a beautiful well distortion rock / hard rock, which has a fine touch combined reverb and delay any open your imagination improvisation!
I use since early 2013.
what I like +: crunchy stains that I could get. Its versatility also in hi-gain to attack chorus and solos, domain, or it does not have to be ashamed that I prefer him on this ground his young cousin P19 (see here http://fr.audiofanzine .com/distorsion-guitare/skreddy-pedals/p19/avis/r.113008.html)