UAD Powered Plug-Ins Manual
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Chapter 31: Moog Multimode Filter
Cutoff
This parameter defines the cutoff frequency of both filter channels in all modes
(lowpass, bandpass, highpass). UA has expanded the available frequency
range of 20 Hz to 12 kHz on the MF-101 Moogerfooger to the broader avail-
able range of 12 Hz to 12 kHz on the Moog Mulitmode Filter.
In lowpass mode, frequencies above the cutoff are attenuated. In highpass
mode, frequencies below the cutoff are attenuated. In bandpass mode, the
cutoff value is the center frequency; attenuation occurs above and below the
cutoff value in this mode.
Tip:
The cutoff value can be adjusted in musical semitone (1/2 step) incre-
ments/decrements using coarse control shortcuts, and 1/4 semitone incre-
ment/decrement using fine control shortcuts. See
“Shortcuts” on page 92
for
more details.
Resonance
Resonance determines the amount of filter feedback, which accentuates the
harmonic content at the cutoff frequency. Higher values can produce a “whis-
tling” quality to the filter, and at very high values the filter may self-oscillate.
Resonance works the same way in all three filter modes.
Pole (Slope)
The filter slope is determined by this switch. The slope defines how “steep” the
frequencies above the cutoff in lowpass mode (or below the cutoff in highpass
mode) are rolled off.
2-Pole
In 2-pole mode, the filter has a slope of 12 dB per octave. For example, in
lowpass mode frequencies that are double the cutoff frequency (an octave)
are attenuated by 12 dB. 2-pole filtering is less aggressive than 4-pole mode,
but has its own unique sound that you may find is better suited for certain
types of signals.
4-Pole
4-Pole mode has a steeper slope (24 dB per octave), so the filtering is more
obvious. This is the “classic” (and luscious) Moog filter, in all its glory, that has
been employed on just about every Moog product, from the Modular to the
Minimoog to the Voyager.
