Chorus - Kurzweil K2661 Musician's Manual

Advanced KDFX
Using the Algorithms
Gate Time is the time that the gate will stay open when the sidechain signal reaches the
Threshold. Its range is 0 to 3000ms.
Ducking reverses the action of the gate. Normally this if set to Off, and the gate opens when the
input signal rises above the threshold. But when this is On, the gate closes when the input signal
rises above the threshold.
Env Time is the amount of time it takes for the sidechain signal envelope to drop below the
threshold. If this time is too short, the gate can close and open too quickly from amplitude
modulation in the sidechain signal. If it is too long, the gate may stay closed until the envelope
has a chance to fall, and some signals would not get through. This parameter is only in effect
when Retrigger is Off.
Retrigger determines whether the gate timer will reset itself each time the sidechain signal goes
above the threshold. If it is On, the timer resets itself, and therefore the gate stays open as long as
the signal is above the threshold, or keeps going above the threshold, within the interval
specified by Gate Time. If it is Off, the gate closes down after Env Time has elapsed—regardless
of the sidechain level—and the sidechain level must fall below the threshold and come back up
again before the gate will open again.

Chorus

Chorus is an effect that gives the illusion of multiple voices playing in unison. The effect is
achieved by detuning copies of the original signal and summing the detuned copies back with
the original. Low frequency oscillators (LFOs) are used to modulate the positions of output taps
from a delay line. The delay line tap modulation causes the pitch of the signal to shift up and
down, producing the required detuning.
The choruses are available as stereo or dual mono. The stereo choruses have the parameters for
the left and right channels ganged, while the dual mono choruses have separate left and right
controls.
Fdbk Level is the level of the feedback signal from the LFO1 delay tap into the delay line.
Negative values polarity-invert the feedback signal.
Tap Lvl sets the levels of the LFO-modulated delay taps. Negative values polarity-invert the
signal. Setting any tap level to 0% effectively turns it off.
Tap Pan sets the stereo position for a given tap's output. The range is -100% for fully left to 100%
for fully right.
LFO Rate sets the speed of modulation of the delay lines with a range of 0.01 to 10 Hz.
LFO Dpth sets the maximum detuning depth of the LFO-modulated delay lines, with a range
from 0 to 50 cents (1/2 semitone).
Tap Dly adds extra delay in front of the LFO modulated delay taps from 0 to 230 ms.
L/R Phase or LFOn LRPhs adjusts the relative phases of the LFOs for the left and right channels
in the stereo Choruses.
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