BOSS OS-2 is an ultimate gain pedal which goes from a slight overdrive to a shredding distortion.
The sentence "less is more" is often true. But in the case of the BOSS OS-2 it fails. Why? Because the OS-2 is not just one pedal, but two, great pedals in one actually! On one hand it is an overdrive, with all the different levels and the subtleness of an overdrive, and on the other it is a massive distortion. The best is, that you can actually combine both and create your own unique sound. One quality of the OS-2 BOSS points out is, that it's distortion keeps the subtle nuances of a single coil pickup unharmed. We actually liked the OS-2 with both Humbucker and Single Coil guitars, but to see what BOSS talks about chain on the TonePedia player the OS-2 with a Strat and set the pedal to different gain stages.