Filter
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ARTURIA – MOOG MODULAR V 2.6 – USER’S MANUAL 105
Low-shell filter
The high-shell filter increases or decreases the frequencies above the cut-off frequency (with
the action of the gain knob).
High-shell filter
A second setting completes the cut-off frequency: the resonance. You will also find it under
the terms “emphasis” or “Q” – as a “filtering quality factor”.
The resonance amplifies the frequencies close to the cut-off frequency; the other remaining
frequencies are unchanged (before the cut-off frequency) or diminished (after the cut-off
frequency).
You can increase the rate of resonance by simply turning the resonance knob.
When you increase the resonance, the filter becomes more selective, the cut-off frequency is
amplified, and the sound begins to “whistle”.
With a high level of resonance, the filter will begin to oscillate on its own, producing a sound
close to a sinusoidal waveform. At this stage, the use of a key follow is very important as you
can create a melody by tuning the filter cut-off frequency with the frequency of the oscillators.