The Boss RT-20 Overdrive guitar effect pedal is a guitar accessory that synthesizes sounds. This Boss effect pedal is connected to a given electric guitar, the sound produced by the guitar is channeled to the pedal, and the sound is digitized to user-set preferences. The guitar pedal accessory utilizes a nominal input level of -20 dBu, an impedance of 1 M Ohms, an output impedance of 1 K Ohms, and a recommended load impedance of 10 K Ohms. The controls on the Boss RT-20 Overdrive guitar effect pedal include the effect on/off pedal, slow/fast pedal, mode knob, rise time knob, effect level knob, and direct level knob. The balance knob, overdrive knob, slow speed knob, fast speed knob, and a drive type switch are also included. This Boss effect pedal is equipped with the Input A jack Input B jack, speed jack, phones jack, Output A jack, Output B jack, and an AC adaptor jack. This guitar pedal accessory also includes power indicators. The Boss effect pedal measures 2.25 inches high by 6.25 inches deep by 6.75 inches wide and weighs less than 3 lbs.