Walrus Audio ARP-87 Multi Function Delay Black Introducing the Walrus Audio ARP-87 , a compact and feature-rich delay pedal known for its wide spectrum of inspirational delay tones. This versatile device offers four main algorithms - digital, analog, lo-fi, and slap back, each presenting a unique echo experience. The Digital algorithm delivers pristine and crystal clear repeats, ideal for rhythmic riffs, while the Analog setting adds warmth and dimension to your chords and lines without being intrusive. The Lo-Fi algorithm , with its adjustable frequency range on the repeats, can range from warm, warped and murky, to straight AM radio. Lastly, the Slap setting makes it effortless to dial in a great slap back echo perfect for smoking chicken pickin' runs. The X knob, a unique and innovative feature, changes functions depending on the chosen Algorithm. It adjusts a specific parameter in each algorithm. In Digital, Analog, and Slap modes, the knob will control modulation depth. In Lo-fi mode, the knob will control Filter width. The Walrus Audio ARP-87 provides endless creative opportunities with other features like smart bypass switching, momentary knob ramp, and the ability to run in trails or no trails mode. Key Features: Four main algorithms: Digital, Analog, Lo-Fi, and Slap X knob adjusts a specific parameter in each algorithm Smart bypass switching Momentary knob ramp Trails/No-trails modes Tap tempo function Maximum delay time: 1000 ms Power requirements: 9VDC (100mA minimum) External tap switch input True bypass No battery operation possible, isolated power supply recommended (not included) Comes in a Frosted Charcoal finish with original artwork by Chris Castro This pedal is in very good and functional condition. Hard scratch on left side of unit. (see photo) Velcro applied to fit on any pedalboard. Includes original box, Pedal pouch, Sticker, and Warranty card