The founding pedal of the great Boss dynasty, the Boss OD-1 Overdrive is not only the first Boss pedal produced in their signature Compact Effector chassis, but also one of the very first overdrives ever made. The OD-1, in addition to all the warm, vintage, tube-like overdrive tones the pedal is known for, is built on a quad op-amp chip and features a simple two-knob interface.