Filter; Filter Modulation - Korg PA 80 User Manual

PAGE 7 - FILTER
Here you can make settings for the filters that will be used by
the oscillators. You can select either a 24 dB/octave low pass
filter with resonance, or a series connection of a 12 dB/octave
low pass filter and a 12 dB/octave high pass filter.

Filter

Selected:
Type: LPF Resonant
Trim:
Frequency A:
Selected
Use this parameter to select an oscillator to put in edit. Alter-
natively, you can select oscillators using the F1-F4 buttons.
Filter Type
This parameter selects the type of filter (Low Pass Resonant,
Low Pass & High Pass) for the selected oscillator. When the
Low Pass & High Pass filter type is selected, the filter B will be
activated.
Low Pass Resonance: 24 dB/octave low
pass filter with resonance
Low Pass & High Pass: 12 dB/octave
low pass filter and 12 dB/octave high pass
filter in series
Trim
Use this parameter to adjust the level at which the audio sig-
nal output from the selected oscillator is input to filter A.
Note: If this value is raised, the sound may distort if Resonance
is set to a high value or when you play a chord.
00...99 Trim level.
Frequency A (Cutoff Frequency A)
This parameter specifies the cutoff frequency of filter A.
Low Pass
Level
12dB/oct
24dB/oct
Frequency
00...99 Cutoff frequency value.
Resonance A
The resonance emphasizes the overtone components that lie
in the region of the cutoff frequency specified by "Frequency",
producing a more distinctive sound. Increasing this value will
produce a stronger effect.
00...99 Resonance value.
|Osc1
Osc1
99
7
This is a filter that cuts the high-
frequency region above the cutoff
frequency.
This is the most common type of filter,
and is used to cut part of the overtone
components, making an originally bright
timbre sound more mellow (darker).
When the "Filter Type" is Low Pass
Resonance, the cutoff will have a
steeper slope.
Program operating mode
Resonance modulation
The effect of resonance
Low Pass
Level
Low resonance value
AMS (Alternate Modulation Source)
Selects the source that will control the "Resonance" level. See
"AMS (Alternate Modulation Source) list" on page 14-19.
Intensity (AMS Intensity)
This parameter specifies the depth and direction of the effect
that "AMS (Alternate Modulation Source)" will have on the
resonance level specified by "Resonance A".
For example if Velocity has been selected, changes in key-
board velocity will affect the resonance.
With positive (+) values, the resonance will increase as you
play more strongly, and as you play more softly the resonance
will approach the level specified by the "Resonance" setting.
With negative (–) values, the resonance will decrease as you
play more strongly, and as you play more softly the resonance
will approach the level specified by the "Resonance" setting.
The resonance level is determined by adding the "Resonance"
and "Intensity (AMS Intensity)" values.
-99...+99 Parameter value.
Filter B
Frequency B (Cutoff Frequency B)
This parameter specifies the cutoff frequency of filter B. This
parameter will be displayed when "Filter Type" is set to Low
Pass & High Pass.
High Pass
Level
12dB/oct
Frequency
00...99 Cutoff frequency value.
PAGE 8 - FILTER MODULATION
These settings let you apply modulation to the cutoff fre-
quency ("Frequency") of the filter for the selected oscillator
to modify the tone.
Filter Mod |Osc1
Selected:
Tracking Low:
Tracking High:
Ramp Low:
When "Filter Type" is Low Pass Resonance, parameters for
filter B will not be editable (greyed out).
Selected
Use this parameter to select an oscillator to put in edit. Alter-
natively, you can select oscillators using the F1-F4 buttons.
14-9
Page 7 - Filter
High resonance value
This filter cuts the low-frequency range that
lies below the cutoff frequency. By cutting
the lower overtones, it lightens the tone.
Osc1
B 3
F 5
+48