1. COARSE - Use this knob to dial in the
general frequency area you want for the
high-pass threshold, low-pass threshold,
band-pass center frequency and notch
filter center frequency.!
2. FINE - Use this knob to refine and focus
the frequency set by the COARSE
FREQUENCY knob. !
3. RESONANCE (NORM/LIM) - This
sliding switch lets you choose between
normal resonance mode (NORM) and
limiting mode (LIM), which limits the
height of a filter’s resonant peak. The
LIM setting prevents circuit overload
when focusing a filter on a strong
harmonic or fundamental frequency,
especially at high Q settings on the
RESONANCE (Q) knob. In other
situations the LIM setting can result in a
very low output signal, and so the
NORM setting is usually preferred.!
4. RESONANCE (Q) - This knob controls
the width/smoothness and narrowness/
sharpness of the filter curves. At low Q
settings, the filter curves are wider and
smoother, with a gentler effect on the
sound (except for the notch filter, which
functions most effectively at low Q
settings). As you increase the Q setting,
the filter curves gradually become
narrower and sharper, which can help
you to focus in on narrow frequency
bands. At higher Q settings, the various
filters can produce resonant peaks in the
filter curves that boost some frequencies
and may require moving the
RESONANCE (NORM/LIM) switch to the
LIM setting to prevent overloading the
circuit (or the INPUT attenuator knob
can be turned down).!
5. F CV 1 - This knob adjusts the strength
of the control voltage signal coming in
through the F CV 1 jack.!
6. F CV 2 - This knob adjusts the strength
of the control voltage signal coming in
through the F CV 2 jack.!
7. NOTCH FREQUENCY/fc - Use this
knob to offset the notch filter’s center
frequency (“fc”) set by the COARSE and
FINE frequency controls. For standard
notch filter behavior, the NOTCH FREQ/
fc control should be set to “1” on the
scale. This standard setting can then be
tweaked by moving the NOTCH FREQ/
fc knob very slightly around “1’. Also if
higher Q values are added via the
RESONANCE knob while the notch filter
is offset from fc, the higher Q values
result in a resonant peak at fc, the higher
Q values result in a resonant peak at fc,
which the notch at the point set by the
NOTCH FREQ/fc knob.!
8. INPUT - this knob adjusts the strength
of the audio signal coming through the
INPUT jack.!
9. Q CV - This knob adjusts the strength of
the Q control voltage signal coming in
through the Q CV jack.
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