The East River Drive Overdrive from Electro-Harmonix is an overdrive pedal which maintains the character of your guitar and playing style while adding an edge to your tone that ranges from mild overdrive to gritty distortion. True bypass switching keeps your tone intact when the pedal is bypassed. This pedal has three knobs. The Drive knob controls the amount of input gain. The Tone knob emphasizes a range of tones from bass to treble. The Vol knob sets the output volume.