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The digital noise gate parameters are described in the following table.
Parameter... Meaning...
Open Level (dB) The loudness threshold for opening the noise gate.
The gate officially opens when loudness rises above
this level, although it can open earlier because of the
Attack Time.
Close Level (dB) The loudness threshold for closing the noise gate. The
gate officially closes when loudness falls below this
level, although it can stay open later because of the
Release Time.
Attack Time (ms) The value in this field is the interval of time after the
volume reaches the Open Level for the gate to fully
open. Opening the gate gradually produces a fade-in
effect instead of an instant on-off sound.
Hold Time (ms) The minimum time for the gate to stay open. Hold
Time is useful when you’ve set high open and close
levels, for example, when your source signal is very
loud. Noise gates set this way tend to react to
repeated percussive passages (such as drum rolls) by
repeatedly opening and closing; this can sound
unpleasant. By setting a hold time, you can ensure
that the gate stays open long enough during
percussive passages.
Release Time (ms) The amount of time after the Close Level is reached
that the gate actually closes. This lets the tail end of
sounds pass through without being clipped.
Look Ahead (ms) The value in this field causes the gate to open slightly
before the sound reaches the Open Level so you don’t
lose the sound’s attack.
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