Digital Delays are used to delay the sound sent to the distributed speakers so that the audience hears the sound from the main speakers and the sound from the distributed speakers at the same time. If all the distributed speakers are the same distance from the main speakers, a single Delay can be used. If the distributed speakers are at different distances, multiple Delays are needed. Multi-Effects Processor Provides a large variety of effects in a single unit. Usually includes reverb, delay, multi-tap delay, chorus, flange, tremolo, vibrato, gates, and other effects.
Some units allow effects to be combined.
It allows low volume sounds to pass through unchanged, but loud sounds are reduced in level. This prevents distortion and possible equipment damage. A gate keeps the signal turned off until its volume reaches a pre-set threshold, then it is turned on. When the signal becomes quiet again it is turned off.