It is an effector that produces reverberation or echo. It has analog delay, digital delay, reverb, and more. Their principles are basically the same and are widely used in stage sound and karaoke. The delay time can be from 50 milliseconds to more than 1 second. The time delay for the electric guitar is generally between 20 and 476 milliseconds, and the time is short to produce a reverberation effect. Echoes are often used when the last note of an electric guitar is played at the height of the guitar so that there are several echoes of reflection that seem to shout to the valley.
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