yellow, and finally to red. Very weak signals do not light up this light at all. When
the light is green, the signal is below the level that results in audible distortion.
When the light is yellow, some low order distortion may be audible, giving the
sound a subtle warm analog quality. When the signal is strong enough to drive
the light into the red, the distortion at the output becomes stronger and more
distinctly audible. Watch this light when you set the DRIVE control for the desired
effect.
The OUTPUT LEVEL control adjusts the strength of the phaser signals that appear
at the AUDIO and AUX output jacks. Use this control to balance the phaser
signals with the bypassed signal. Note that neither the DRIVE nor the OUTPUT
LEVEL controls affect the strength of the bypassed signal.
Figure 10 – Block diagram of the MF-103 , showing panel controls, switches, and jacks. Pedal/control jacks are not
shown, but performs the same functions as the control knobs.
USING BOTH AUDIO OUTPUTS TOGETHER
If you listen to just the main AUDIO output, or just the AUX output, you will hear
the classic ‘comb filter’ sound that arises from the characteristic phaser
frequency response. However, if you feed the AUDIO output to one speaker and
the AUX output to another speaker, the two outputs together will not have peaks
and dips in the overall frequency response. Instead, some parts of the sound
spectrum will be coming from one speaker and other parts will be coming from
the other speaker. As the LFO modulates the phaser, the sound will seem to swirl
around in space. This is a terrific way of creating a stage-filling ambience from
any sound source. It is also a great way to simulate a rotating speaker.
EXPRESSION PEDALS AND VOLTAGE CONTROL
You now know what each of the rotary control knobs does to the sound of the
MF-103. With the exception of DRIVE and OUTPUT LEVEL, each knob has an
expression pedal/control input which duplicates its effect. This enables you to
plug in up to four expression pedals to play the MF-103 with your feet as well as
with your hands. The moogerfooger EP-1 Expression Pedal is designed for this
(15 pages)
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