KDFX Reference
KDFX Algorithm Specifications
10-113
Figure 10-50 Block diagram of envelope following filter
Parameters
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Wet/Dry The amount of modulated (wet) signal relative to unaffected (dry) signal as a percent.
Out Gain The overall gain or amplitude at the output of the effect.
FilterType The type of resonant Þlter to be used. Lowpass, Highpass, Bandpass, or Notch.
Min Freq The base frequency of the resonant Þlter. The Þlter resonant frequency is set to the Min
Freq while the signal envelope is at its minimum level or below the threshold.
Freq Sweep How far the Þlter frequency can change from the Min Freq setting as the envelope
amplitude changes. Freq Sweep may be positive or negative so the Þlter frequency can
rise above or fall below the Min Freq setting.
Resonance The resonance level of the resonant Þlter. Resonance sets the level of the resonant peak (or
the amount of cut in the case of the notch Þlter).
Threshold Tthe level above which signal envelope must rise before the Þlter begins to follow the
envelope. Below the threshold, the Þlter resonant frequency remains at the Min frequency.
Atk Rate Adjusts the upward slew rate of the envelope detector.
Rel Rate Adjusts the downward slew rate of the envelope detector.
Smth Rate Smooths the output of the envelope follower. Smoothing slows down the envelope
follower and can dominate the attack and release rates if set to a lower rate than either of
these parameters.
Wet/Dry 0 to 100%wet Out Gain Off, -79.0 to 24.0 dB
FilterType Lowpass Min Freq 58 to 8372 Hz
F Freq Sweep -100 to 100%
0Hz 2k 4k 6k Resonance 0 to 50 dB
Threshold -79.0 to 0.0 dB Atk Rate 0.0 to 300.0 dB/s
Rel Rate 0.0 to 300.0 dB/s
Smth Rate 0.0 to 300.0 dB/s
R Input
L Input
Envelope
Follower
Resonant Filter
R Input
L Input
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