Kurzweil K2661, Musician’S Reference Manual

Page: 220 / 500

10-138
KDFX Reference
KDFX Algorithm Specifications
time controls how long it takes the compressor to respond to a reduction in signal levels. At long release
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: CompSmooth. The smoothing parameter will increase both
the attack and release times, although the effect is signi
fi cant 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 con fi gured 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 con fi guration 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.
In the feedback con fi guration, 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. In the feed-forward con
fi guration, the delay affects both the main signal and the side chain, and
so is of limited usefulness. In compressors which use more than 1 PAU, the delay affects the main signal
only, regardless of the side chain con
fi guration.
A meter displays the amount of gain reduction applied to the signal as a result of compression.
Parameters:
Page 1
Page 2
Page 3
In/Out In or Out ReverbGain Off, -79.0 to 24.0 dB
Reverb W/D 0 to 100 %wet Rv Time 0.5 to 30.0 s, Inf
Rv PreDlyL 0 to 620 ms Rv PreDlyR 0 to 620 ms
Rv HFDamp 8 to 25088 Hz CompIn/Out In or Out
Rv Type Hall1, etc. Rv DiffScl 0.00 to 2.00 x
Rv SizeScl 0.00 to 4.00 x
Rv Density 0.00 to 4.00 x
Comp Atk 0.0 to 228.0 ms Comp Ratio 1.0:1 to 100.0:1, Inf:1
Comp Rel 0 to 3000 ms Comp Thres -79.0 to 0.0 dB
CompSmooth 0.0 to 228.0 ms CompMakeUp Off, -79.0 to 24.0 dB
CompSigDly 0.0 to 25.0 ms FdbkComprs In or Out
|||||||||||||||||||||||||||||| Reduction
-dB 40 20 12 8 6 4 2 0