Two modes: Crunch and Overdriven
Crunch is the lighter of the two. I play this on a lower gain (6 to noon) with the mid's punched and get some great tones out of it. It's very responsive with much less compression than that of the "overdriven" setting. I use it when playing softer items that need a good solo or lead.
Overdriven is a high gain monster. I'll play this at 3 o'clock and higher on the gain. There is a lot of high gain out there with other pedals but the feedback and tones of most leave much to be desired. This pedal is the exception providing very good high gain tones to either scoop out the mids or push them to the max. The gain differs in that it offers a very natural gain tone versus others that provide a more digital gain feeling.
Boost: There is an independent boost circuit that will cut the mix as needing for solo's or prominent riffs. It also works independently without the distortion side so you get somewhat of a 2 in 1 pedal.
Highly recommend for those looking for a high gain pedal with some character.