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The Electro-Harmonix Holy Grail Max is an easy-to-use, stellar-sounding reverb pedal. The Holy Grail Max delivers four types of studio-quality reverb: Spring, Hall, Plate, and Reverse all designed for the discerning guitarist but also great with other instruments on stage or in the studio. Included is an analog wet and dry control that provides a constant volume curve as you turn the Blend knob from fully dry to fully wet while also keeping your dry signal analog through the pedal. Controls Reverb Switch Knob chooses the reverb mode. From left to right, the modes are Spring, Hall, Plate, and Reverse. Time Knob adjusts the decay time, or reverb length and size, for the Spring, Hall, and Plate reverbs. In Reverse mode, the Time knob sets the length of time between striking a note and the reverb fade-in. While in Plate mode, when Time is set to its maximum position, the reverb decay is over 30 seconds creating a lush reverb wash with each new note. Blend Knob controls the wet and dry mix from 100 percent Dry (counter-clockwise position) to 100 percent Wet (clockwise position). Your Dry signal remains analog from input to output through the HG Max. The Footswitch selects whether the HG Max is engaged or in True Bypass mode. When the effect is engaged, the LED is lit. It has 1/4-inch Input and Output jacks.