Bomb Factory Plug-ins Guide38
A Lowpass Filter allows all frequencies up to a
certain frequency to pass, and cuts frequencies
above the cutoff frequency. It removes the high
frequencies from a tone, making it sound more
mellow or muted. The Moogerfooger Lowpass
Filter contains a genuine four-pole lowpass fil-
ter. We say “genuine” because the four-pole fil-
ter—a major part of the “MOOG Sound” of the
60s and 70s—was first patented by Bob Moog in
1968! Bob worked directly with Bomb Factory to
ensure that the digital version preserved all the
character, nuances, and personality of his origi-
nal classic analog design.
An Envelope Follower tracks the loudness con-
tour, or envelope, of a sound. Think of it like
this: each time you play a note, the envelope
goes up and then down. The louder and harder
you play, the higher the envelope goes. In the
Moogerfooger Lowpass Filter, the Envelope Fol-
lower drives the cutoff frequency of the Lowpass
Filter. Since the envelope follows the dynamics
of the input, it “plays” the filter by sweeping it
up and down in response to the loudness of the
input signal.
How the Moogerfooger Lowpass
Filter is Used
Envelope Section
The Amount knob determines how much the
envelope varies the filter. When the knob is
counterclockwise, the envelope signal has no ef-
fect on the filter. When the knob is fully clock-
wise, the envelope signal opens and closes the
filter over a range of five octaves.
The Smooth/Fast switch determines how closely
the envelope tracks the loudness of the input
signal. Some sounds (like guitar chords) have
long, rough envelopes, and often sound better
with less dramatic changes in the filter. Other
sounds (like bass or snare drum) are quick and
sharp, and sound great when the filter closely
tracks their attack.
Filter Section
Control the filter using the Cutoff and Reso-
nance knobs and the 2-Pole/4-Pole switch.
Cutoff opens and closes the filter. Turned coun-
terclockwise, fewer high frequencies pass
through the filter. Turned clockwise, more high
frequencies pass.
Envelope
The 2/4 pole switch selects the filter slope
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