17
Main Features and Operation
Filter Section
The K-Station’s Filter is a Low Pass type. As the FREQUENCY knob is
adjusted anticlockwise, harmonics are gradually removed from the
sound. When almost closed, only the fundamental frequency remains.
Fully closed and no sound at all passes. This type of Filter is musically
the most useful, especially for bass sounds.
FREQUENCY Knob
This controls the basic Cut off frequency of the filter. Set fully clock-
wise, the filter is wide open allowing all frequencies (harmonics) pro-
duced by the Oscillators to sound. As the knob is turned anticlockwise,
the filter closes, cutting out harmonics, starting with the highest, then
increasingly lower ones until only the fundamental or nothing at all is
allowed to sound (fully anticlockwise).
If there is silence when the VOLUME knob is turned up, it is most likely
that the Filter is fully closed. Turn the Frequency knob clockwise to
open the filter.
RESONANCE Knob
This knob controls the Resonance of the Filter. The control will boost
frequencies at the Cut off frequency. On on some synthesizers, this
control is known as Emphasis since it will emphasize certain frequen-
cies. 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 K-Station produces a high pitched whistling sound, it is probably
due to this knob is being adjusted too far clockwise. If this self-oscillat-
ing 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 fre-
quency, such as in Acid bass lines and other very edgy sounds.
MOD ENV DEPTH Knob
Controls the amount of change to the filter Cut off (set by the FRE-
QUENCY 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 nega-
tive modulation. The filter will close as the MOD ENV runs through its
cycle. Adjusting the knob clockwise from centre will introduce an
increasing amount of positive modulation. The filter will be opened by
the MOD ENV.
SLOPE Button
Controls how drastically the frequencies above 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.
KEY TRACK Knob
Controls the amount of change to the filter Cut off (set by the FRE-
QUENCY knob) by the pitch of the note played. Set fully anticlockwise
and there is no change to the filter Cut off frequency. With clockwise
movement there will be an increasing amount of modulation. The filter
will be opened more as higher notes are played on the keyboard. This
control is used to define how the timbre of a sound changes over the
keyboard.
At the fully clockwise position, the filter tracks the pitch changes in a 1
to 1 ratio. This means that with RESONANCE set to a high level, the
pitch of the Filter’s self - oscillation will increase in semitone steps as
notes are played on the keyboard. This effect is akin to adding an extra
(Sine Wave) Oscillator to the sound when notes are played on the key-
board.
LFO 2 DEPTH Knob
Controls the amount of change to the filter Cut off (set by the FRE-
QUENCY knob) by LFO 2. In its central position there is no change to
the filter Cut off frequency. Adjusting the knob anticlockwise from cen-
tre will introduce 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
player may be processed by the filter and effects. Refer to Page 36 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 25.
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