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18
Threshold
Ratio
Attack
Release
Gain
sets the level below which expansion takes place. Signals above the threshold will remain
unaltered. Turning the control anticlockwise raises the threshold level and allows more of the signal to be
expanded. Alow threshold would be used to reduce noise, a higher threshold to increase the dynamic range of
a signal.
is the 'strength' of expansion below the threshold level. The higher the ratio, the greater the effect.
At an expansion ratio of 2:1, the effect is mild and suitable for subtle noise reduction or dynamic range
enhancement. At higher ratios the effect becomes harder and more like a noise gate. The light bar graph
indicates the amount of gain reduction taking place.
sets the time the Expander takes to respond once the signal has passed below the threshold. This can
be done automatically, the circuitry continuously analysing the signal to determine optimum attack time. Or
it can be set to a fixed value of 2ms.
determines the time taken for the gain to return to normal after the signal comes back above the
threshold level. For hard gating, this may be set to a short value. Longer release times are suitable for
dynamic range enhancement or subtle noise reduction.
is the output level control for the entire channel, Compressor, Expander and Limiter. The output level
light bar graph meter indicates output level when the channel is switched in circuit. When the channel is
bypassed, the meter indicates INPUT level.
Expansion:Setting the controls