Filter Section - Novation KS Rack User Manual

Filter Section

Filter Section
The Filter can be used as a Low Pass, High Pass or Band Pass type.
FREQUENCY Knob
This controls the basic Cut off frequency of the Filter. The Low Pass type
of Filter is the most common type of Filter found on classic analogue syn-
thesizers and is musically the most useful, especially for bass sounds. As
the FREQUENCY knob is adjusted anticlockwise, harmonics are gradually
removed from the sound. When almost closed, only the fundamental fre-
quency remains. Fully closed and no sound at all passes.
With the High Pass Filter type, as the FREQUENCY knob is adjusted
clockwise, harmonics are gradually removed from the sound. When
almost fully anticlockwise, only the fundamental frequency remains. When
Fully clockwise and no sound at all passes.
With the Band Pass Filter type, a narrow band of frequencies are passed,
centered on the position of the FREQUENCY knob. This kind of Filter is
useful when it is desired to pass only a specific frequency present in a
sound.
RESONANCE Knob
This knob controls the Resonance of the Filter. The control will boost fre-
quencies at the Cut off frequency. On on some synthesizers, this control
is known as Emphasis since it will emphasize certain frequencies. At the
zero position there is no effect. Turning clockwise slowly introduces the
emphasis.
Set fully clockwise, the Filter will begin to self - oscillate, producing a new
pitched element (similar to feedback on an electric guitar).
Note : At least a small signal must be fed into the Filter in order for the
resonance to take effect. It is not possible for the filter to self - oscillate if
no signal at all is fed into it.
If the KS 4 / KS 5 produces a high pitched whistling sound, it is probably
due to this knob is being adjusted too far clockwise. If this self-oscillating
effect is not desired, keep the Resonance control away from the extreme
clockwise setting. Increasing the Resonance is very good for bringing out
modulation (movement or change) in the filter Cut off frequency, such as
in Acid bass lines and other very edgy sounds.
OVERDRIVE Knob
This knob controls how much the filter is overdriven. When used in large
amounts it will have the effect of making the sound richer and slightly dis-
torted.
MOD ENV DEPTH Knob
Controls the amount of change to the filter Cut off (set by the FREQUEN-
CY knob) by the Modulation Envelope. In its central position there is no
change to the filter Cut off frequency. Adjusting the knob anticlockwise
from centre will introduce an increasing amount of negative modulation.
MAIN FEATURES AND OPERATION
The filter will close as the MOD ENV runs through its cycle. Adjusting the
knob clockwise from centre will introduce an increasing amount of posi tive
modulation. The filter will be opened by the MOD ENV.
SLOPE Button
Controls how drastically the frequencies above (Low Pass), below (High
Pass) or around (Band Pass) the Cut off point are removed from the
sound. When the 12dB position is selected, the Cut off slope is gentle so
higher harmonics are not attenuated (reduced in volume) as sharply as
they are when the 24dB position is selected.
TYPE Button
Determines whether the Filter is acting as a Low Pass, High Pass or Band
Pass type.
LFO 2 DEPTH Knob
Controls the amount of change to the filter Cut off (set by the FREQUEN-
CY knob) by LFO 2. In its central position there is no change to the filter
Cut off frequency. Adjusting the knob anticlockwise from centre will intro-
duce an increasing amount of negative modulation. The Filter will close
and open in time with LFO2 (this creates the popular wow wow effect of
LFO2 wavefrom is set to Triangle).
Adjusting the knob clockwise from centre will introduce an increasing
amount of positive modulation. The filter will open and close in time with
LFO 2.
NOTE : An external audio signal such as a microphone, guitar or CD play-
er may be processed by the filter and effects. Refer to Page 51 in the
Advanced Features Chapter for more details on setting up this feature.
More functions associated with the Filter can be found in the Filter Menu.
See Page 37.
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