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LOTRM 2009 © GregAE p 1
Lord of the Ring (Modulation)
2009
If I had to choose just one Moogerfooger pedal to compliment the Voyager
1
, the choice would be easy; I’d pick the
MF-102 Ring Modulator. Why? It’s because the Ring Modulator is the only Moogerfooger pedal designed to produce sound
instead of simply filtering sound or adding effects
2
. In fact, the Ring Modulator (RM) extends the Voyager’s sonic palette to
an entirely new class of sounds that can’t easily be duplicated by other means. This feature alone makes the RM the ideal
‘desert island’ pedal companion for the Voyager, but, as you will soon learn, it’s capable of much, much more.
What kind of sounds does RM produce? All manner of
bells, chimes, gongs, tubular bells and electro-metallic
timbres, collectively referred to as ‘clangorous’ sounds.
These sounds are distinctive because they contain
inharmonic frequencies, meaning that their harmonic
spectrums aren’t based on integer multiples of a
fundamental frequency like those that appear in sawtooth or
square waves. Whereas a sawtooth or square wave has an
orderly series of decreasing harmonics, the overtones of
clangorous sounds can be spread far and wide across the
frequency spectrum, with varying amplitudes and phases.
By itself, the Voyager can produce only a limited range of
clangorous timbres with its built-in modulation capabilities.
The MF-102 Ring Modulator greatly extends this range by
generating a wealth of inharmonic textures, making it an
excellent accompaniment to the Voyager. So how can you
make the most of it, with or without a Voyager? Read on
and find out!
Concepts
A Ring Modulator performs a simple arithmetic function: it takes two input frequencies, and generates the sum (F1 + F2) and
difference (F1 – F2) signals while suppressing the original frequencies. For example, if two sine waves of equal amplitude
are applied to the input, say one at 200Hz and one at 300Hz, the ring modulator will output two sine waves of equal
amplitude: one at 500Hz (the sum) and one at 100Hz (the difference). The use of sine waves here provides a simple example
to illustrate what a Ring Modulators does, but what happens if two complex waves are used instead of simple sine waves?
The answer is that you get a complex result. The individual harmonics of each wave interact with each other, producing a
complex product of sum and difference frequencies. Such is the case with two square waves, as shown in Figure 1.
1. “Lord of the Ring (Modulation)” (aka “LOTRM”) was written a few years before Moog Music introduced the Little Phatty
(‘LP’) synthesizer. While the Ring Modulator works equally well with the LP or Voyager, the LP’s lack of CV expansion jacks
limits the interface possibilities of the Ring Modulator when compared to what can be done with a Voyager and VX-351 CV
Expander.
2. Technically, this is no longer true. Long after LORTM was originally published online (in 2006), Moog Music released the
MF-107 FreqBox, which can also produce sounds through its internal oscillator. The FreqBox can be used as a stand-alone
sound source, much like the Ring Modulator’s Carrier oscillator.
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Résumé du contenu

Page 1 - Lord of the Ring (Modulation)

LOTRM 2009 © GregAE p 1Lord of the Ring (Modulation)2009If I had to choose just one Moogerfooger pedal to compliment the Voyager1, the choice would

Page 2 - Component Parts

LOTRM 2009 © GregAE p 10With these signal routings in place, make the following settings:1. On the VX-351, set the Attenuator for the Filter Envelop

Page 3 - The Carrier VCO

LOTRM 2009 © GregAE p 11Figure 4. The same Voyager signal, but with the RM’s Drive control at maximum, and attenuated to anequivalent levelThe soun

Page 4 - Carrier In vs. Audio In

LOTRM 2009 © GregAE p 12Figure 6. The same Voyager signal, but with the RM’s Drive control at maximum, and attenuated to anequivalent levelAs we ob

Page 5 - MF-102 Ring Modulator Diagram

LOTRM 2009 © GregAE p 13Regarding his basic approach to using the MF-102 Ring Modulator, Narrowcaster wrote:"I think of it in terms of four bas

Page 6 - Footswitch

LOTRM 2009 © GregAE p 2Figure 1. Two ring-modulated square wavesFigure 1 shows the result of ring modulating two square waves together; one at 350H

Page 7 - Cool Ring Mod Tricks

LOTRM 2009 © GregAE p 3The LFOThe RM’s LFO is a basic Low Frequency Oscillator with a minimum of features. The RM’s LFOsports Rate and Amount contro

Page 8 - 3. Octave Doubling

LOTRM 2009 © GregAE p 4The Carrier Oscillator produces a triangle waveform as shown in Figure 2:Figure 2. The Carrier Oscillator waveformAlthough t

Page 9 - 5. Ring Mod as VCA

LOTRM 2009 © GregAE p 5MF-102 Ring Modulator Diagram

Page 10 - 6. Drive as Waveshaper

LOTRM 2009 © GregAE p 6Back PanelVoyager owners know that all control voltage inputs are identified by colored jack nuts on the instrument’s back pa

Page 11 - LOTRM 2009 © GregAE p 11

LOTRM 2009 © GregAE p 7Cool Ring Mod TricksThe MF-102 User Guide lists some ways of using the Ring Modulator, so I won’t repeat those here. Instead,

Page 12 - LOTRM 2009 © GregAE p 12

LOTRM 2009 © GregAE p 82. Squaring things upSince the Carrier Oscillator is strictly a triangle wave, its usefulness can be limiting when combined w

Page 13 - LOTRM 2009 © GregAE p 13

LOTRM 2009 © GregAE p 94. Tracking ModulationSo far we’ve focused on the Carrier Oscillator, mainly using it to augment the Voyager’s three oscillat

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