Kurzweil Forte - Manual (Page 210)

The Effects Chain Editor
Effects Parameters
8-16
Multiband Compression
The Multiband Compression effect has Attack, Release, Smooth, Signal Delay, Ratio,
Threshold, and MakeUp Gain parameters for each of the three bands (“Low”, “Mid”, and
“High”). 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 signal.
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 “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.
Super Gate
Super Gate is a more sophisticated gate that includes these two functions:
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 off 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 which 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 movement of the taps causes the pitch of the signal to shift
up and down, producing the required detuning.