Korg NAUTILUS Series, Parameter Manual, Page: 169 / 961

PROGRAM > AL-1: Filter 5–3: Filter Mod.
159
There is one difference between the two, however: the AL-
1’s Filter tracking is affected by Portamento, so that it
changes smoothly during glides.
Intensity to A [–99…+99]
This controls how much the keyboard tracking will affect
Filter A ‘s cutoff frequency. The overall effect of the
Keyboard Track is a combination of this
Intensity value and
the overall Keyboard Track shape.
Intensity to B [–99…+99]
This controls how much the keyboard tracking will affect
Filter B ‘s cutoff frequency.
Intensity to B applies only when the Filter Routing is set to
Serial or Parallel , and when Link is Off . In Single and
24dB (4-Pole) modes, or if Link is On , this parameter is
grayed out.
Key
Low Break [C–1…G9]
This sets the breakpoint note between the two lower ramps.
Center [C–1…G9]
This sets the center of the keyboard tracking. At this key, the
keyboard tracking has no effect on the filter frequency, or on
any AMS destinations.
High Break [C–1…G9]
This sets the breakpoint note between the two higher ramps.
Ramp
The effect on the filter cutoff is a combination of the ramp
values, as set below, and the Intensity to A and B parameters.
When Intensity is set to +99, a ramp of 50 changes the filter
frequency by 1 octave for every octave of the keyboard, and
a ramp of +99 changes the frequency by 2 octaves for every
octave of the keyboard.
+Inf and –Inf are special settings which create abrupt
changes for split-like effects. When a ramp is set to +Inf or –
Inf, the keyboard tracking will go to its extreme highest or
lowest value over the span of a single key.
For more detailed explanations, please see “3–2a: Keyboard
Track,” on page 65
Bottom-Low [-Inf, –99…+99, +Inf]
This sets the slope between the bottom of the MIDI note
range and the Low Break key. For normal key track, use
negative values.
Low-Center [-Inf, –99…+99, +Inf]
This sets the slope between the Low Break and Center keys.
For normal key track, use negative values.
Center-High [-Inf, –99…+99, +Inf]
This sets the slope between the Center and High Break keys.
For normal key track, use positive values.
High-Top [-Inf, –99…+99, +Inf]
This sets the slope between the High Break key and the top
of the MIDI note range. For normal key track, use positive
values.
Key Follow
To create the classic Key Follow effect, in which the filter
frequency tracks the pitch of the keyboard:
1. Set the Filter Frequency to 30.
2. Set the Keyboard Track Intensity to +99.
3. Set the Bottom-Low and Low-Center ramps to -50.
4. Set the Center-High and High-Top ramps to +50.
5. Set the Center Key to C4.
The settings for the Low Break and High Break keys don’t
matter in this case.
5–3b: Filter EG
The EGs modulate the Filter A and B cutoff frequencies over
time. You can control how strongly they will affect the filters
in three different ways:
• Set an initial amount of EG modulation, using the EG
Intensity parameters.
• Use velocity to scale the amount of the EG applied to the
filter.
• Use any AMS source to scale the amount of the EG
applied to the filter.
You can use all three of these at once, and the results are
added together to produce the total EG effect.
To set up the EGs themselves, including attack and release
times, levels, and so on, see “7–1: EG 1 (Filter),” on
page 169.
Filter A
EG Select [EG 1 (Filter), EG 2 (Pitch),
EG 3, EG 4, Amp EG]
This selects an EG to modulate Filter A’s Frequency.
There are four assignable EGs, in addition to the Amp EG.
Each of these can be used as a modulation source to control a
wide variety of parameters.
In the midst of all this flexibility, we thought it would also be
good to provide a little structure. With this in mind, EG 1 is
named EG 1 (Filter) and EG 2 is labeled EG 2 (Pitch).
Please take these names as suggestions, rather than
restrictions. If you like, you’re free to use these EGs to
control any EG or AMS destination, or to use other EGs to
control Filter Frequency and Pitch.
Velocity Intensity [–99…+99]
This lets you use velocity to scale the amount of the EG
applied to Filter A.
EG Intensity [–99…+99]
This controls the initial effect of the EG on Filter A’s cutoff
frequency, before any velocity or AMS modulation.
AMS [List of AMS Sources]
This selects an AMS modulation source to scale the amount
of the EG applied to Filter A.