The Dos Mos is a brand new Dual Mosfet Preamp with 2 independant outputs, capable of up to 25 db of gain per channel. It is also switchable, so you can run it as a single channel preamp with an adjustable boost. The "Uno" channel may also be used as a buffer. This pedal is a great clean boost, but it's also capable of driving any amp into saturation.