As its name suggests, a delay pedal takes the original sound and mixes it with a delayed version, which can be any anywhere from a few milliseconds to a few seconds. A delay pedal is also called echo, though the latter is typically associated with older analog units, such as a Maetstro Echoplex. Delay pedals are available in either analog or digital versions, with the former noted for its warm sound and the later for its flexibility. Sometimes, a delay pedal will offer modulation effects in addition to the echo or delay. A subtle use of echo can be heard in Eric Johnson's setup, while the Edge of U2 shows the complexity available in delay effects.