Electro-Harmonix Holy Grail Nano Reverb Guitar Effect Pedal .. USED / GUARANTEED

The Holy Grail is designed so that as you turn the REVERB knob from its minimum position to the 12 o’clock position you will hear a subtle amount of reverb added to the output. As you turn the REVERB knob from 12 o’clock to its maximum position the amount of reverb you hear will increase dramatically.