Instruments and Effects

76 Chapter 4 Dynamics
Noise Gate
The Noise Gate is commonly used to suppress unwanted noise that is audible when the
audio signal is at a low level. You can use it to remove background noise, crosstalk from
other signal sources, and low-level hum, among other uses.
The Noise Gate works by allowing signals above the Threshold level to pass unimpeded
while reducing signals below the Threshold level. This allows you to remove lower-level
parts of the signal, while allowing the intended parts of the audio to pass.
Noise Gate Parameters
Main Parameters
 Threshold slider and field:
Sets the level (in decibels) below which the signal is reduced.
 Reduction slider and field: Sets the amount by which the signal is reduced.
 Attack knob and field: Sets the amount of time it takes to fully open the gate after
the signal exceeds the threshold.
 Hold knob and field: Sets the amount of time the gate is kept open after the signal
falls below the threshold.
 Release knob and field: Sets the amount of time it takes to fully close the gate after
the signal falls below the threshold.
 Hysteresis slider and field: Sets the difference (in decibels) between the threshold
values that open and close the gate, to prevent it rapidly opening and closing when
the input signal is close to the threshold.
 Lookahead slider and field: Sets how far ahead (in milliseconds) the noise gate
analyzes the signal.
Sidechain Parameters
 Monitor button: Turn on to preview the Sidechain signal, including the effect of the
High and Low Cut filters.
 High Cut slider and field: Sets the upper cutoff frequency for the sidechain signal.
 Low Cut slider and field: Sets the lower cutoff frequency for the sidechain signal.
When no external sidechain is selected, the input signal is used as the sidechain.