Filter - Korg RK-100S Parameter Manual

RK-100S parameter guide

FILTER

The filter section changes the tonal character of the oscillators by passing only
the desired portion of the sound - either above (Low Pass), below (High-Pass), or
centered on (Band Pass) the cutoff frequency. The RK-100S has two filters (filter 1
and filter 2), and you can change their routing to create more complex filter sounds.
FILTER 1
CUTOFF
Sets the cutoff frequency. Increasing this value will raise the cutoff frequency.
"CUTOFF" can be varied by time-variant changes produced by FILTER EG, by
keyboard playing dynamics (velocity), and by note location (keyboard tracking).
If the "CUTOFF" value is set too low, the volume may be extremely low, or
you may hear no sound at all.
RESONANCE
Sets the resonance of the filter. This will emphasize the overtones near the cutoff
frequency that are specified by "CUTOFF," adding a distinctive character to
the sound. Increasing this value will increase the effect. Since movement of the
"CUTOFF" knob will affect the overtones that are boosted by resonance, it is
best to adjust "CUTOFF" and "RESONANCE" in conjunction with each other.
LPF
HPF
BPF
Low resonance value
Depending on the cutoff frequency or the input audio, increasing this value
may cause distortion.
18
[000...127]
[000...127]
High resonance value
BALANCE
Selects the filter type. Intermediate settings will produce a response that is
between the two filter types.
LPF12 (–12dB/oct), LPF24 (–24dB/oct): Low Pass Filter. LPF (Low Pass Filter) is the
most common type of filter; it passes the frequencies below the cutoff frequency
and cuts the region above. Raising the cutoff frequency ("CUTOFF" value) will
produce a brighter tone.
LPF (Low Pass Filter)
-24dB/oct
Cuto
HPF (–12dB/oct): High Pass Filter. HPF (High Pass Filter) passes the frequencies
above the cutoff frequency and cuts the region below. Use this when you want
to make the tone thinner. However, raising the cutoff frequency too far will
drastically reduce the volume.
HPF (High Pass Filter)
Cuto
BPF (–6dB/oct): Band Pass Filter. BPF (Band Pass Filter) passes the frequencies in
the region of the cutoff frequency, and cuts all other frequency regions. Use this
when you want to emphasize only a specific portion of the sound.
BPF (Band Pass Filter)
Cuto
THRU: The sound will output directly, without passing through the filter.
[LPF24...LPF12...HPF...BPF...THRU]
-12dB/oct
Frequency
Frequency
Frequency