Native Instruments MASCHINE Manual page 612

Parameter
TIME Section
Attack
Hold
Release
OUTPUT Section
Mix
The Gate on the controller: MAIN page.
Side-Chain Input Page
The Gate in the Control area: Side-Chain Input page.
Description
Use Attack to adjust how fast the Gate reacts to the incoming
signal: the more you dial it to the right, the slower it will react,
resulting in a softer transition between the gated and the not
gated parts of the signal.
The Hold parameter is used to determine how long the gated
signal is held; lower values will result in a more "choppy" effect.
The time the Gate will take to release the input signal after it
rises above the threshold.
Mix lets you adjust the amount of the effect in relation to the
dry original audio signal.
Effect Reference
Dynamics
MASCHINE - Manual - 612