Chorus Menu - Novation KS Rack User Manual

ADVANCED FEATURES
The Chorus Menu
This effect was originally designed to simulate the sound of many people
singing together (hence the name Chorus) in contrast to a single voice.
Instrumentally, consider the sound of a 12 string guitar compared to a 6
string guitar. The very slight detuning of the individual strings actually
gives a richer quality to the sound.
Chorus is an effect produced by mixing a continuously delayed version of
the audio signal back with the original. The timing of the delayed version
is very small and is controlled by the Chorus's own internal LFO (not to be
confused with the two LFOs available on the front panel). The characteris-
tic swirling Chorus effect is the result.
The Chorus is also capable of behaving as a Phaser. The way a Phaser
works is in fact entirely different to the Chorus. A portion of the audio sig-
nal is split off and phase shifted at certain frequencies. It is then mixed
back with the original signal to generate the characteristic swishing effect.
The functions available in the Chorus Menu are :

Chorus Menu

Page Function Display
1 Type CHOR Type
2 Rate CHOR Mod Rate
3 Mod Depth CHOR Mod Depth 0...127
4 Mod Centre CHOR Centre Posn -64...63
5 Feedback CHOR Feedback
6 LFO Sync Initial Position CHOR Init Posn
7 Wheel Level CHOR Wheel Level -64...63
Type (Menu Page 1)
Determines whether the Chorus is behaving as a standard Chorus or as a
Phaser.
Rate (Menu Page 2)
Controls how fast the dedicated Chorus LFO is oscillating. A fairly slow
speed is recommended. Higher speeds tend to introduce a vibrato like
quality to the sound.
Note : The dedicated Chorus LFO should not be confused with the two
LFOs available on the front panel.
Mod Depth (Menu Page 3)
The Chorus has it own LFO which is continuously changing the delay
time. Mod Depth sets how much of the fixed delay time is being modulat-
ed. Large amounts of modulation will produce a more noticeable effect.
Moderate amounts are recommended.
Note : The dedicated Chorus LFO should not be confused with the two
LFOs available on the front panel.
Mod Centre (Menu Page 4)
The Stereo Chorus can actually be thought of as two continuously vari-
able delays. The delay variations are being controlled by the Chorus dedi-
cated LFO. The LFO is constantly moving the two delay amounts from
minimum to maximum. When one delay is at max, the other is at min
(hence the stereo effect).
The Mod Centre function moves the middle point between the Min and
Max values. Experiment with this control for the desired effect.
Feedback (Menu Page 5)
This function controls how much of the delayed signal is fed back to the
input of the Chorus generator. The Chorus effect benefits from low levels
of feedback. When acting as a Phaser (see the Chorus Type setting on
Page 29), the effect often requires higher levels of feedback.
LFO Sync Initial Position (Menu Page 6)
As well as being able to synchronize to MIDI clock (tempo), the dedicated
Chorus LFO may have its initial position set after a specific MIDI event is
received (see the Global Sync Mode function on Page 51).
The initial positions available are shown in the table above. For example,
if the Chorus initial position sync is set to RGT , after an appropriate MIDI
event, the Chorus effect will move from the right to the left.
Wheel Level (Menu Page 7)
This sets how much movement of a Master keyboard's Modulation wheel
will introduce the Chorus effect.
Value
CHORUS-PHASER
0...127
-64...63
OFF...RGT
• •
43
The Chorus Menu
Chorus LFO Sync Initial Pos
Display Function
OFF Off
LFT Left
MID Centre
RGT Right