
344 Audio Plug-ins
12.14 Steinberg Expander
Expander reduces the output level in relation to the input level for signals below the set
threshold. This is useful when you want to enhance the dynamic range or reduce the noise
in quiet passages. You can either use the knobs or drag the breakpoints in the graphical
display to change the Threshold and the Ratio parameter values.
The following parameters are available:
Threshold (-60 to 0dB)
Determines the level where expansion "kicks in". Signal levels below the set threshold
are affected, but signal levels above are not processed.
Ratio (1:1 to 8:1)
Determines the amount of gain boost applied to signals below the set threshold.
Soft Knee button
If this button is off, signals below the threshold are expanded instantly according to the
set ratio ("hard knee"). When Soft Knee is activated, the onset of expansion is more
gradual, producing a less drastic result.
Attack (0.1 to 100ms)
Determines how fast Expander responds to signals below the set threshold. If the attack
time is long, more of the early part of the signal (attack) passes through unprocessed.
Hold (0 to 2000ms)
Sets the time the applied expansion will affect the signal below the Threshold.
Release (10 to 1000ms or Auto mode)
Sets the amount of time it takes for the gain to return to its original level when the signal
exceeds the threshold level. If the Auto button is activated, Expander will automatically
find an optimal release setting that varies depending on the audio material.
Analysis (0 to 100) (Pure Peak to Pure RMS)
This parameter determines whether the input signal is analyzed according to peak or
RMS values (or a mixture of both). A value of 0 is pure peak and 100 pure RMS. RMS
mode operates using the average power of the audio signal as a basis, whereas Peak
WaveLab 7
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