Boss BC2 Combo Drive effetcs pedal. A simple solution if you are trying to get a classic vintage "AC Amp) inspired tone. You can get a variety of different tones from the single control knob, everything from vintage clean and slight crunch, thru to creamy drive and full on overdrive.
Features include

Wide range of tones with a single knob -from classic crisp clean and punchy crunch to creamy overdrive with long sustain and beyond

Natural and dynamic response to picking nuance at any knob position

Provides warm combo tones and authentic combo-amp cabinet resonance