Kurzweil KDFX, Manual

Page: 83 / 164

Using the Algorithms
Compressors, Expanders, and Gates
5-7
Threshold is the level in dBFS (decibels relative to full scale) above which the signal begins to
be compressed. Adjustable from -79.0 to 0 dB.
MakeUpGain allows additional output gain to compensate for gain reduction in the
compressor. It is essentially the same parameter as Out Gain, with which it is summed. The
minimum is -79.0, and the maximum summed gain (Make Out Gain) is +24.0 dB.
Expansion
Algorithms containing Expanders have these controls:
Atk or Exp Atk (Attack), how fast the expander turns off when the input signal rises above the
threshold level, adjustable from 0.0 to 228.0 ms.
Rel or Exp Rel (Release), how fast the expander turns back on after the signal drops below the
threshold level, adjustable from 0 to 3000 ms.
Ratio or Exp Ratio , how much the gain is reduced below the expansion threshold, adjustable
from 1:1.0 (no expansion) to 1:17 (extreme downward expansion).
Threshold or Exp Threshold , the level below which the signal is expanded, adjustable from
-79.0 to 0 dB.
In addition, the two-segment compressors with expander have separate Ratio and Threshold
controls for each of the compression segments.
Multiband Compression
The Multiband Compression Algorithm has Attack , Release , Smooth , Signal Delay , Ratio ,
Threshold , and MakeUp Gain parameters for each of the three bands (ÒLowÓ, ÒMidÓ, and
ÒHighÓ). In addition, it has:
Crossover1 and Crossover2 . These set the frequencies which divide the three compression
frequency bands. The two parameters are interchangeable, so either may contain the higher
frequency value. The range is 16 to 25088 Hz, in increments of a semitone.
Gates
SC Input lets you select which input channel(s) will control the sidechain, which is responsible
for opening and closing the gate. It can be set to L, R, or the average of the two channels,
(L+R)/2. You can use this, if you arrange the signal paths and pan controls appropriately, to
gate one mono signal with a different mono signalÑthe venerable ÒKeyfexÓ effect.
Gate Time is the time that the gate will stay open after the sidechain signal reaches the
Threshold. Its range is 0 to 3000ms.
Ducking reverses the action of the gate. Normally this if set to ÒOffÓ, and the gate opens when
the input signal rises above the threshold. But when this is ÒOnÓ, the gate closes when the input
signal rises above the threshold.
Atk (Attack) Time is the time for the gate to ramp from closed to open (reverse if Ducking is
on) after the signal rises above threshold, adjustable from 0.0 to 228.0 ms.
Rel (ease) Time is the time for the gate to ramp from open to closed (reverse if Ducking is on)
after the gate timer has elapsed, adjustable from 0 to 3000 ms.