Reverb is a shaking or echoing effect that is added to a sound, often by an electronic device.
The unit includes built-in digital effects like reverb.
reverb in British English
(ˈriːvɜːb)
noun
an electronic device that creates artificial acoustics
reverb in American English
(rɪˈvɜrb; for n., also ˈriˌvɜrb)
US
noun
1.
an electronic or mechanical device for simulating the effect of sound reverberation, used with electronically amplified musical instruments or for recordings