Nonlinear Functions - Kurzweil K2600 - MUSICIANS GUIDE REV A PART NUMBER 910330 CHAP 16 Function Manual

DSP Functions
The DSP Functions
There are three DSP functions that add waveforms to a layerÕs existing sample: SINE+, SAW+,
and NOISE+.
The parameters on the control-input page for the SINE+ function affect the pitch of the sine
waveform without affecting the pitch of the existing sample. The control-input page for the
SINE+ function is similar to those for the regular waveforms above. There are parameters for
coarse adjust, key tracking, velocity tracking, Source 1 and Source 2, and a pad. There are also
parameters for Þne adjust and Þne Hertz adjust.
The SAW+ function is virtually identical to the SINE+ function; the only difference is in the
shape of the waveform.
The NOISE+ function is tied to the level of the sample to which itÕs added. It will generate fairly
white noise (that is, nearly equal amplitude at all audible frequencies) as long as the amplitude
of the sample is nonzero. The amplitude of the noise is multiplied by its gain control (the Adjust
parameter on its control-input page), then added to the signal. To add a short burst of noise at
the beginning of a sound, assign ENV2 as the value of one of the Source parameters, then edit
ENV2 to produce an envelope with a rapid decay.
The control parameters for NOISE+ are similar to those for SINE+ and SAW+, except that there
are no parameters for Þne adjust or Þne Hertz adjust.

Nonlinear Functions

High Frequency Stimulator
Distortion
Shaper
Double Shaper
The functions in this category have a variety of effects on the signal. What they have in common
is that they can add partials to the signal that were not present at their inputs.
The nonlinear functions can produce dramatic changes in timbre, resulting in all sorts of new
and modiÞed sounds. One thing to keep in mind is that sounds with a large number of high-
frequency partials can be subject to distortion at the high end of the keyboard, especially when
youÕre using more than one of the nonlinear DSP functions. You might also hear a bit of aliasing
with some sounds. Aliasing refers to unintended partials that occur below the fundamental
pitch of a sound. The easiest way to remove this distortion or aliasing is to reduce the level of the
Adjust parameter on the control-input page for whichever nonlinear DSP functions youÕre
working with. When youÕre using PWM followed by DIST or SHAPER, youÕd reduce the level
of the Adjust parameter for the DIST or SHAPER function. You can also use key tracking
(KeyTrk, usually with a negative value), and key tracking in combination with the Keytrack
Start (KStart) parameter thatÕs described on page 16-4.
Even with the damping effects of KeyTrk and KStart, you may come up with sounds that are
fantastic in the low range, but gritty in the high range. You can transpose the keymap down to
counteract this, but thatÕs the nature of the nonlinear functions. In extreme cases, you can lower
the HiKey of the layer to disable the high end completely.
High Frequency Stimulator (HIFREQ STIMULATOR)
The overall effect of this three-stage function is to boost the high frequency partials of the signal,
and depending on the settings of the control inputs, it can add high-frequency partials to the
signal as well. ItÕs useful for building sounds that cut through the mix, and have a bright crisp
nature.
16-42
Two-parameter Shaper
Wrap
Lowpass Filter with Clipping
Pulse Width Modulation