Kurzweil KDFX, Manual

Page: 87 / 164

Using the Algorithms
Distortion
5-11
Max Freq is the resonant frequency of the Þlter at the peak of the internal envelope. It can be set
lower than Min Freq (above), in which case the Þlter will sweep downwards, then back up.
Range is 16 to 8372 Hz.
Trigger is the input-signal threshold at which the envelope detector triggers. Range is -79 to
0 dB.
Retrigger is the input-signal threshold at which the envelope detector resets, so that it can
trigger again. This parameter is only useful when it is set below the value of Trigger. Range is
from -79 to 0 dB.
Env Rate is the envelope detector decay rate. This can be used to prevent false triggering.
When the signal envelope falls below the retrigger level, the Þlter can be triggered again when
the signal rises above the trigger level. Since the input signal can ßuctuate rapidly, it is
necessary to adjust the rate at which the signal envelope can fall to the retrigger level. The
range is 0 to 300.0 dB/sec.
Rel Rate is the downward slew (release) rate of the triggered envelope generator. The range is 0
to 300.0 dB/sec.
Smth Rate slows down the envelope follower. If set lower than the release rate, it will dominate
it. You can also use the smoothing rate to lengthen the attack of the internal envelope. The
range is 0 to 300.0 dB/sec.
LFO Filter
The LFO Þlter is continuously swept between two resonant frequencies over a period of time.
The LFO frequency, expressed in BPM and beats, can be Þxed or set to follow
System tempo.
(See Chapter 4 for information about tempo control of KDFX parameters.)
Min Freq and Max Freq are the low and high limits of the resonant frequency as the Þlter is
swept. You can set the Min Freq higher than the Max Freq, in which case the Þlter will sweep
Òupside downÓ relative to the controlling clock. The range for both is 16 to 8372 Hz.
LFO Shape is the waveform type for the LFO. Choices are Sine, Saw+, Saw-, Pulse, and Tri.
LFO PlsWid (Pulse Width). When the LFO Shape is set to Pulse, this sets the pulse width as a
percentage of the waveform period. When the width is set to 50%, the result is a square wave.
This parameter has no effect if other waveform types are chosen. Range is 0 to 100%.
LFO Smooth smooths (removes the higher harmonics from) the Saw+, Saw-, and Pulse
waveforms. A Sawtooth wave becomes more like a triangle wave, and a Pulse wave becomes
more like a sine wave. Range is 0 to 100%.
Distortion
Distortion Algorithms on KDFX may also include a parametric equalizer or a cabinet simulator.
Dist Drive applies a boost to the input signal to overdrive the distortion algorithm into soft
clipping. This will tend to make the signal very loud, so you may have to reduce the Out Gain
as this parameter is increased. Range is 0 to 96 dB.
Warmth is a lowpass Þlter in the distortion control path. This Þlter may be used to reduce some
of the harshness of some distortion settings without reducing the bandwidth of the signal.
Range is 16 to 25088 Hz.
Highpass allows you to reduce the bass content of the distortion content in the smaller
distortion algorithms that donÕt have true parametric EQ. Range is 16 to 25088 Hz.