Playing and editing Programs
46
Using Filters
The filters allows 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 Filter page.
Filter Routing
Each oscillator has two filters, Filter A and Filter B. The
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.
Parallel
also uses both Filter A and Filter B. The oscillator
feeds both filters directly, and the outputs of the two filters
are then summed together.
The
24dB/4-pole
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 beyond the cutoff frequency, as well as a
slightly more delicate resonance. Many classic analog synths
used this general type of filter.
Serial and Parallel Routing
Filter Types
This selects the parts of the sound which 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. The selections will change slightly
according to the selected
Filter Routing
, to show the correct
cutoff slope in dB per octave.
Low Pass.
This cuts out the parts of the sound which 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 which 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
Filter A (Low Pass)Oscillator Filter B (High Pass)
Oscillator
Filter A (Low Pass)
Filter B (High Pass)
Low Pass
High Pass
Band Pass
Band Reject
Cuto Frequency
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