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552 EFFECTS MENU
threshold window program-dependently. It's possible that a slight change occurs
already at -25 dB. This so-called "soft knee" behavior provides a soft, musical
compression process.
• Ratio: This parameter regulates the compression ratio. For example, a value of 10:1
means that when the threshold level is reached, the input level is increased 10dB, while
the output is only 1dB louder. A lower compression, e.g. 2:1, is recommended for subtle
compression of group or sum signals, while 50:1 produces a very hard limiting that
cannot be controlled inaudibly by even the most transparent compressor...
• Attack & release: This parameter specifies how quickly the compressor responds
when the threshold is reached (attack) or how quickly the signal applies normal
amplitude once the signal drops below this level (release). These in/out times may be set
broadly. Note however, that the adaptive regulation of the plug-in may cause actual
times to deviate. This semi-automatic process enables quick adjustment, without
causing artifacts (raw audio picture caused by fast adjustment, too low/inefficient
compression when time constants are too long).
Expander/Gate
This plug-in is basically the reverse variation of a compressor: Where a compressor
generally makes a signal more quiet when it exceeds the threshold, the expander makes
the signal below the threshold (lower ratio) or nearly cutoff (high ratio). This makes removing
audio disturbances or softening over-compressed signals quick and efficient .
Essentially, all parameters of the compressor plug-in apply here as well; only the resulting
control process and setting of the threshold and ratio will need to be considered.
Expander/gate parameters
• Mode: See compressor
• SC listen: See compressor
• SC filter: Like the compressor, this filter is certainly not a high-pass, but rather a
bandpass. This means that you may tune the detector circuit to a specific range within
which it should respond. For most expansion or gating tasks, this process is better than
broadband detection.
• Threshold: Like the compressor, whereby control is active below the threshold value.
• Ratio: Compared to the compressor, the expansion behavior is reversed. A ratio of
10:1, for example, indicates that the signal below the threshold value must increase
10dB, to apply 1dB amplification.
• Attack & release: See compressor