Using Filters - Korg KROSS Operation Manual

Playing and editing Programs

Using Filters

The filters allow you to diminish or emphasize specified
frequency areas of the sound.
The tone of the sound will depend significantly on the
filter settings.
The basic filter settings, including the routing, type, cutoff
frequency, and resonance, are set on the P-FILTER> BASIC
page.
Filter Type Filter Routing
Filter Routing
Each oscillator has two filters, Filter A and Filter B. The
Filter Routing parameter controls whether one or both of
the filters are used, and if both are used, it controls how they
are connected to each other.
The Single routing uses only Filter A as a single 2-pole,
12dB/octave filter (6dB for Band Pass and Band Reject).
The Serial routing uses both Filter A and Filter B. The
oscillator first goes through Filter A, and then the output of
Filter A is processed through Filter B.
The Parallel routing also uses both Filter A and Filter B.
The oscillator feeds both filters directly (and allow
independent settings for each), and the outputs of the two
filters are then summed together.
The 24dB(4Pole) routing merges both filters to create a
single 4-pole, 24dB/octave filter (12dB for Band Pass and
Band Reject). In comparison to Single, this option produces
a sharper roll-off of frequencies beyond the cutoff frequency,
as well as a slightly more delicate resonance. Many classic
analog synths used this type of filter.
Serial and Parallel Routing
Oscillator Filter A (Low Pass)
Oscillator
36
Resonance
Filter B (High Pass)
Filter A (Low Pass)
Filter B (High Pass)
Filter Types
This selects the parts of the sound that will be affected by the
filter, as described below. With the Serial and Parallel
routings, you can independently set the types for Filter A and
Filter B.
The filters will produce very different results depending on
the selected filter type.
Low Pass: This cuts out the parts of the sound that are
higher than the cutoff frequency. Low Pass is the most
common type of filter, and is used to make bright timbres
sound darker.
High Pass: This cuts out the parts of the sound that are
lower than the cutoff frequency. You can use this to make
timbres sound thinner or more buzzy.
Band Pass: This cuts out all parts of the sound, both highs
and lows, except for the region around the cutoff frequency.
Since this filter cuts out both high and low frequencies, its
effect can change dramatically depending on the cutoff
setting and the oscillator's multisample.
With low resonance settings, you can use the Band Pass
filter to create telephone or vintage phonograph sounds.
With higher resonance settings, it can create buzzy or nasal
timbres.
Band Reject: This filter type–also called a notch filter–cuts
only the parts of the sound directly around the cutoff
frequency. Try modulating the cutoff with an LFO to create
phaser-like effects.
Filter Types and Cutoff Frequency
Low Pass
High Pass
Band Pass
Band Reject
Cutoff Frequency