Korg PA3 User Manual

Filter: Filter Mod

The resonance emphasizes the overtone components that lie in
the region of the cutoff frequency specified by “Frequency”, pro-
ducing a more distinctive sound. Increasing this value will pro-
duce a stronger effect.

00…99

Resonance value.

Selects the source that will control the “Resonance” level. See
“AMS (Alternate Modulation Source) list” on page 77.

This parameter specifies the depth and direction of the effect
that “Res. Mod. by AMS (Resonance modulated by AMS)” will
have on the resonance level specified by “Resonance (Resonance
A)”.

For example if Velocity has been selected, changes in keyboard
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.

This parameter specifies the cutoff frequency of filter B. This
parameter will be displayed when “Filter Type” is set to Low Pass
& High Pass.

00…99

Cutoff frequency value.

These settings let you apply modulation to the cutoff frequency
(“Frequency”) of the filter for the selected oscillator to modify
the tone.

When “Filter Type” is Low Pass Resonance, parameters for filter
B will not be editable (greyed out).

These settings specify keyboard tracking for the cutoff frequency
of the filter for the selected oscillator. The way in which the cut-
off frequency is affected by the keyboard location you play can
be  specified  by  the  “Key  Low”,  “Key  High”,  “Ramp  Low”  and
“Ramp High” parameters.

Keyboard  tracking  will  apply  to  the  range  below  the  specified
Low note number, and above the specified High note number.

C–1…G9

Lowest/Highest note in the range.

These parameter specifies the angle of keyboard tracking.

If “Intensity to A” and “Intensity to B” are set to +50, “Ramp
Low” is set to –62 and “Ramp High” is set to +62, the angle of the
change in cutoff frequency will correspond to the keyboard loca-
tion (pitch). This means that the oscillation that occurs when
you increase the “Resonance (Resonance A)” will correspond to
the keyboard location.

If you set “Ramp Low” to +43 and “Ramp High” to –43, the cut-
off frequency will not be affected by keyboard location. Use this
setting when you do not want the cutoff frequency to change for
each note.

-99…+99

Angle value.

Here  is  how  cutoff  frequency  is  affected  by  keyboard  location
and the Ramp setting (“Intensity to A” and “Intensity to B” =
+50):

The effect of resonance

Low resonance value

High resonance value

Level

Frequency

High Pass

This filter cuts the low-frequency range that 
lies below the cutoff frequency. By cutting 
the lower overtones, it lightens the tone.

12dB/oct

Cutoff frequency

Key

Low Ramp=+99

Low Ramp=+43

Low Ramp=0

Low Ramp=–62

Low Ramp=–99

High Ramp=+99

High Ramp=+62

High Ramp=0

High Ramp=–43

High Ramp=–99

Low Key

High Key