Korg NAUTILUS Series, Parameter Manual, Page: 155 / 961

PROGRAM > AL-1: OSC/Pitch 4–1: OSC Basic
145
Detuned Saw 2 is similar to Detuned Saw 1 , except that the
second sawtooth is 180 degrees out of phase. This produces
a timbre similar to pulse width modulation, with the
Detune
parameter controlling both detune and the speed of the PWM
effect.
Triangle produces a pure tone with relatively few overtones.
Square/Triangle simultaneously creates a square wave (in
which the pulse width is fixed at 50%) and a triangle wave.
Wave Morph crossfades between the two.
Initial Phase [-180…+180, Random]
This controls the initial phase of Oscillator 1, in 1-degree
increments.
Random: with each note-on, the waveform will start from a
random point along the waveform, to simulate the varying
phase relationships between oscillators in analog
synthesizers.
Wave Morph [000…100]
The function of this parameter changes depending on the
Waveform selection, above.
When Waveform is set to either Saw/Pulse or
Square/Triangle , Wave Morph crossfades between the two
waveforms. At 0 , you’ll hear only the first waveform; at 100 ,
you’ll hear only the second waveform; and at 50 , you’ll hear
an equal mix of both.
When Waveform is set to Double Saw , Detuned Saw 1 , or
Detuned Saw 2 , Wave Morph controls the volume of the
second Sawtooth wave.
Wave Morph is not available when the Waveform is set to
Saw, Pulse, or Triangle.
AMS [List of AMS Sources]
This selects an AMS source to control Wave Morph . For a
list of AMS sources, see “Alternate Modulation Source
(AMS) List” on page 901.
AMS Intensity [–100…+100]
This controls the depth and direction of the AMS modulation
for
Wave Morph .
Pulse Width/Phase/Detune [000…100]
The name and function of this parameter changes depending
on the
Waveform selection, above.
When the Waveform is set to Pulse or Saw/Pulse, this is
named Pulse Width , and controls the width of the Pulse
waveform. For details, see “More on Pulse Width,” below.
When Waveform is set to Double Saw , it is named Phase ,
and controls the phase relationship between the two
Sawtooth waves.
When Waveform is set to Detuned Saw 1 or 2 , this is
named Detune , and controls the detune amount between the
two Saws. The adjustments are in half-cent increments, so
that 0 = 0 cents, 50 = 25 cents, and 100 = 50 cents. Saw 1 is
tuned up, and Saw 2 is tuned down, so that the tonal center is
maintained.
More on Pulse Width
Pulse waveforms are simple, rectangular shapes. The Pulse
Width sets the percentage of the waveform spent in the “up”
position. A few examples are shown in the diagram below.
Note that a square wave is just a pulse wave with the width
set to 50%.
The width controls the timbre of the oscillator, from pure
and hollow at 50% (a square wave) to thin and reedy at the
extremes.
At settings of 0 and 100– or when the Pulse Width is
modulated to these values via AMS– the Pulse wave will be
silent, since these eliminate the “pulse” altogether.
Pulse waveform at different widths
The real magic of the pulse wave comes when you modulate
the width, using the AMS source and intensity below. Try
using a medium-speed triangle LFO, or a sweeping EG.
AMS [List of AMS Sources]
This selects an AMS source to control Pulse
Width/Phase/Detune . For a list of AMS sources, see
“Alternate Modulation Source (AMS) List” on page 901.
AMS Intensity [–100…+100]
This controls the depth and direction of the AMS modulation
for
Width/Phase/Detune .
Waveform Type and Modulatable Parameters
Frequency
Note: The Sub-Oscillator’s frequency is always exactly one
octave below that of Oscillator 1. This means that adjusting
any of the controls in this section, including
Octave ,
Transpose , Tune , and Frequency Offset , will affect the
Sub-Oscillator as well as Oscillator 1.
Octave [–2[32’], –1[16’], +0[8’], +1[4’], +2[2’]]
This sets the basic pitch of Oscillator 1, in octaves. The
default is +0[8’].
Waveform Type Morph
Pulse Width/
Phase/Detune
Saw n/a n/a
Pulse n/a Pulse Width
Saw/Pulse
Xfade between saw
and pulse
Pulse Width
Double Saw Volume of 2nd saw Phase
Detuned Saw 1 Volume of 2nd saw Detune
Detuned Saw 2 Volume of 2nd saw
Detune and PWM
effect
Triangle n/a n/a
Square/Triangle
Xfade between
square & triangle
n/a
Pulse Width = 10% Pulse Width = 25%
Pulse Width = 75% Pulse Width = 50%