KDFX Reference
KDFX Algorithm Specifications
10-215
times, the signal may stay compressed well after the signal falls below threshold. At short release times,
the compressor will open up almost as soon as the signal drops.
For typical compressor behavior, the attack time is considerably shorter than the release time. At very
short attack and release times, the compressor is almost able to keep up with the instantaneous signal
levels and the algorithm will behave more like distortion than compression. In addition to the attack and
release times, there is another time parameter: “Smth Band”. The smoothing parameter will increase both
the attack and release times, although the effect is significant only when its time is longer than the attack or
release time. Generally the smoothing time should be kept at or shorter than the attack time.
You have the choice of using the compressors configured as feed-forward or feedback compressors. For
feed-forward, set the FdbkComprs parameter to “Out”; for feedback compression, set it to “In”. The feed-
forward configuration uses the input signal as the side-chain source. The feedback compressor on the
other hand uses the compressor output as the side-chain source. Feedback compression tends to be more
subtle, but you cannot get an instant attack.
The signal being compressed may be delayed relative to the side chain compression processing. The delay
allows the signal to start being compressed just before an attack transient arrives. Since the side chain
processing “knows” what the input signal is going to be before the main signal path does, it can tame
down an attack transient by compressing the attack before it actually happens. This feature works whether
the side chain is configured for feed-forward or feedback.
A meter is provided for each compression band to display the amount of gain reduction that is applied to
the signal as a result of compression.
Parameters
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In/Out In or Out Out Gain Off, -79.0 to 24.0 dB
FdbkComprs In or Out Crossover1 16 to 25088 Hz
Signal Dly 0.0 to 25.0 ms Crossover2 16 to 25088 Hz
Atk Low 0.0 to 228.0 ms Ratio Low 1.0:1 to 100.0:1, Inf:1
Rel Low 0 to 3000 ms Thres Low -79.0 to 24.0 dB
Smth Low 0.0 to 228.0 ms MakeUp Low Off, -79.0 to 24.0 dB
Atk Mid 0.0 to 228.0 ms Ratio Mid 1.0:1 to 100.0:1, Inf:1
Rel Mid 0 to 3000 ms Thres Mid -79.0 to 24.0 dB
Smth Mid 0.0 to 228.0 ms MakeUp Mid Off, -79.0 to 24.0 dB
Atk High 0.0 to 228.0 ms Ratio High 1.0:1 to 100.0:1, Inf:1
Rel High 0 to 3000 ms Thres High -79.0 to 24.0 dB
Smth High 0.0 to 228.0 ms MakeUpHigh Off, -79.0 to 24.0 dB
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