KORG M3 - Manual (Page 66)

Playing and editing Programs
58
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.
Low Pass (12dB/oct): 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 (12dB/oct): 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 (6dB/oct): 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 (6dB/oct): 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
Resonance
Resonance emphasizes the frequencies around the
cutoff frequency, as shown in the diagram below.
When this is set to 0, there is no emphasis, and
frequencies beyond the cutoff will simply diminish
smoothly.
At medium settings, the resonance will alter the timbre
of the filter, making it sound more nasal, or more
extreme. At very high settings, the resonance can be
heard as a separate, whistling pitch.
To make the resonance track the keyboard pitch, please
see “Key Follow,” on page 50 of the Parameter Guide.
Modulating the filters
You can modulate the filter cutoff frequency using the
Filter EG, the LFOs, keyboard tracking, and other
built-in and MIDI controllers. This is a great way to
add a rich variety of tonal change to the sound.
Filter EG
The Filter EG is a multi-stage envelope, which you can
use to modulate the filter (naturally!) as well as other
Program parameters. The EG itself is set up on the EG
tab; the way that it affects the filters is controlled by the
Low Pass
High Pass
Band Pass
Band Reject
Cutoff Frequency
Low resonance
High resonance