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First used by Les Paul, e.g. I'm Forever Blowing Bubbles. (Modern digital delay units, the first of which was the Eventide Harmonizer, involve sound waves being converted from analog to digital signals, and clocked through large banks of RAM memory. Paul achieved time delay by stretching audiotape between two reel-to-reel tape decks spaced several feet apart.) The Edge of U2 is a notable user of this effect in his music. An obvious example of this is Where the Streets Have No Name

A Delay or Echo pedal creates a copy of an incoming sound and slightly time-delays it, creating either a "slap" (single repetition) or an echo (multiple repetitions) effect. Delay pedals may use either analog or digital technology. Analog delays often are less flexible and not as "perfect" sounding as digital delays, but some guitarists argue that analog effects produce "warmer" tones. Early delay devices actually used magnetic tape to produce the time delay effect. Some common Delay pedals are:

* Boss DD-6
* Line 6 DL-4 Delay Modeler
* Line 6 Echo Park
* T-Rex Engineering's Replica
* Boss DD-20 Giga-Delay

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