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What is delay?
The delay is an audio effect or an effects unit. It basically
records an input signal and then plays it back after a
period of time. We can say that delay is a form of echo.
The first delay effects were achieved using tape loops
improvised on reel-to-reel audio tape recording systems.
A famous tape delay delay unit was the Echoplex, first
made in 1959; it was used by some of the most notable
guitar players of the era
There are different delay types. The most common ones
include:
Haas effect - delay of 40 ms or less, adds a sense of
space but it's not perceived as an effect.
Short delay - 40 to 150 ms
Medium delay - 150 to 400 ms
Long delay - 400 to 1,000 ms