Kurzweil K2600 - MUSICIANS GUIDE REV A PART NUMBER 910331 CHAP 10 Manual page 47

In the stereo Chorus 1 and Chorus 2, the relative phases of the LFOs modulating the left and right channels
may be adjusted.
Delay Input
Figure 10-15 Delay for a Single LFO
The settings of the LFO rates and the LFO depths determine how far the LFOs will sweep across their
delay lines from the shortest delays to the longest delays (the LFO excursions). The Tap Delays specify the
average amount of delay of the LFO modulated delay lines, or in other words the delay to the center of the
LFO excursion. The center of LFO excursion can not move smoothly. Changing the center of LFO
excursion creates discontinuities in the tapped signal. It is therefore a good idea to adjust the Tap Dly
parameter to a reasonable setting (one which gives enough delay for the maximum LFO excursion), then
leave it. Modulating Tap Dly will produce unwanted zipper noise. If you increase the LFO modulation
depth or reduce the LFO rate to a point where the LFO excursion exceeds the speciÞed Tap Dly, the center
of LFO excursion will be moved up, and again cause signal discontinuities. However, if enough Tap Dly is
speciÞed, Depth and Rate will be modulated smoothly.
As the LFOs sweep across the delay lines, the signal will change pitch. The pitch will change with a
triangular envelope (rise-fall-rise-fall) or with a trapezoidal envelope (rise-hold-fall-hold). You can choose
the pitch envelope with the Pitch Env parameter. Unfortunately rate and depth cannot be smoothly
modulated when set to the ÒTrapzoidÓ setting.
Figure 10-16 Pitch Envelopes (i) Triangle and (ii) Trapzoid
Parameters for Chorus 1
Page 1
Wet/Dry -100 to 100%wet
Fdbk Level -100 to 100%
Xcouple 0 to 100%
HF Damping 16 Hz to 25088 Hz
Range of LFO
Shortest
Delay
LFO Xcurs
Tap Dly
Time
(i)
Out Gain
Pitch Env
KDFX Algorithm Specifications
Center Longest
of LFO
LFO Xcurs
Time
(ii)
Off, -79.0 to 24.0 dB
Triangle or Trapzoid
KDFX Reference
Delay
10-47