The Gate effect pedal can be used to mute out unwanted sounds from the inputted audio signal by gating out sounds under a given threshold. The Gate pedal also has a side-chain input, this allows for the signal from another device to be used to trigger the gate. For example, if a synth is inputted into the Gate and then a drum machine is side-chained through the Gate, the Gate will only become active when the drum machine makes a sound.
gate - Sets the threshold of the effect, any frequencies under the gate will be muted.
hold - Allows definition of the amount of time the Gate will stay open after the signal falls below the given threshold.
attack - Sets the amount of time for the Gate to change from open to closed, can give the effect of the sound fading in.
release - Sets the amount of time the Gate takes to go from closed to open. A fast release will abruptly cut of the sound once it has fallen below the given threshold, a slower release will smoothly change from closed to open much like a slow fade out.
gain - Output volume.