Kurzweil K2700 - Page 127

Program Edit Mode
Editing VAST Programs With KVA Oscillators
3-84
RES NOISE
A noise generator combined with a low pass lter with resonance control. Use the Noiz Frq
parameter to control the cut o frequency of the lter. Use the Noiz Q parameter to control
the amplitude of the resonance (a boost or cut at the cut o frequency). One technique for
use of this function is to set a high value for Noiz Q (so that you hear the resonance create
a tone), and then on the DSP CTL page set C4 as an initial frequency for Noiz Frq, and
set Keytrk to 100ct/key on the Noiz Frq sub page. Doing this causes the noise resonance
frequency to match the note of the key played.
SHAPED SAW
e Shaped Saw oscillator is a sawtooth oscillator with the ability to morph its output shape
between sawtooth and sine wave (without crossfading). is oscillator’s distinctive parameter
is Shape, which controls the morphing. With Shape set to 0, the oscillator produces a pure
sawtooth wave. With Shape set to 127, the oscillator produces a pure sine wave. Values in
between morph between the two wave shapes.
PWM (Pulse Width Modulation) [Aliased (not recommended)]
is oscillator’s distinctive parameter is PWM Wid, which adjusts pulse width from values of
1-99. With PWM Wid set to a value of 50, PWM produces a square wave. e further the
PWM Wid parameter is set from 50, the narrower the pulse width becomes, changing the
shape of the output waveform and thus altering the oscillator’s tonal quality.
FM OPERATOR / FM SAW OPERATOR / FM TRI OPERATOR
ese oscillators are capable of basic Frequency Modulation synthesis, by using a sine,
sawtooth, or triangle wave carrier signal which can be modulated by an input signal.
Frequency modulation allows for the creation of complex timbres by rapidly modulating the
frequency of a carrier signal with an input signal. ese oscillators must be placed after the
sound source in an algorithm (either keymap or oscillator) to hear the intended eect.
Use the FM Op Inp parameter to adjust the level of the input signal and frequency
modulation depth. Try adjusting the FM Op Inp parameter to hear the input source
modulate the carrier signal and nd interesting timbres. When FM Op Inp is set to a low
value, only the sine, sawtooth, or triangle wave carrier signal will be heard. As the input
signal level is turned up, the operator will create brighter timbres. Input signals with complex
or noisy timbres will more easily create noisy timbres, so the FM Op Inp parameter may
need to be turned down. Input signals with simple timbres may be too quiet to apply
modulation, so the FM Op Inp parameter may need to be turned up.
3 Block:
PWM (Pulse Width Modulation) [Anti-Aliased (recommended)]
Same as 2 Block PWM, See above.