After my tests, this is what we get ... we have after the amendments made by MSM Workshop 2 switches with 2 positions and 1 to 3 switch positions, they provide a wide range of sounds no less than a dozen sounds from ... Clean sweet / bluesy heavy a Disto, through the Crunch, an overdrive, a mushy fuzz and saturation in the bunch, my neighbors ... the one who does not find his SON is also invited to the flute ... (lol) The pedal restores and more widely respected all my guitars, each of my amps, the sound is clear, moreover modified this pedal made me rediscover my gear on the one hand and the other character even more true than in the original version of my amp it sounded even better than Sovtek usual, excellent before moving to recordings of new songs! Tests; the 3 knobs are at noon ... otherwise we'll be here all night so the possibilities are enormous! 3 + Switches positions of knobs = infinity setting the switch 3 positions on the left (Vintage Rat) provides a sound ranging from clean to crunch by light guitar and microphones used, the volume of the sound is more than reasonable but already allows quite a lot by playing with the other 2 switches that increase / decrease the gain and the other switch on the rear to increase / decrease the treble The switch 3 positions on the right (hot Rat) allows a range crunch to distortion more or less spicy depending on the different settings, there's plenty to explore and find your sound easily, it is simply excellent! The switch 3 position in central position, so there it grows! the sound can become HUGE! Bass love these as I say more ... that all new components produce a real plus for her, that we are dealing with a pedal which has several (12 possible combinations) This pedal can work really ITS is very intuitive, you spend hours with great happiness, we have fun, you discover new sounds from vintage rock to rock's heaviest ... for you to discover! Modified to make absolutely invaluable to use the quintessence of this pedal! A big THANK YOU to MSM Workshop ... Guillaume for his patience and kindness I actually did change my Boss DS-1 by MSM and it's also a mega slap! myspace.com / dominiquevassart myspace.com / phaesis