The MF-101 Low Pass Filter features an
all-analog Bob Moog-designed lowpass filter. This Moogerfooger filter
is a direct descendant of the original Moog synthesizers. It contains
two complete modular functions: a voltage-controlled lowpass filter and
an envelope follower. Now you can own the same classic Moog filter as
in the Minimoog™ and Moog Modular synthesizers. Each of the four
performance parameters may be controlled smoothly and continuously by
panel knob, expression pedal, or external control voltage. Audio input
and output signals may be set to any instrument or line level.
Housed in a rugged steel and hardwood
enclosure, the MF-101, like other Moogerfooger instruments, has the
classic good looks, versatility, and high sound quality of the
well-known vintage Moog synthesizers.
Features
- Audio In: 1/4" phone jack - accepts any instrument-level or line-level audio signal.
- Audio Out: 1/4" phone jack -4 dBm nominal output level.
- Cutoff: 1/4" TRS- accepts Moogerfooger or equivalent expression pedals or CV.
- Resonance: 1/4" TRS- accepts Moogerfooger or equivalent expression pedals or CV.
- Amount: 1/4" TRS- accepts Moogerfooger or equivalent expression pedals or CV.
- Mix: 1/4" TRS- accepts Moogerfooger or equivalent expression pedals or CV.
- Envelope Out: - delivers the Envelope Control voltage for use by other voltage-controlled devices.
- Cutoff: Rotary control which varies the filters cutoff frequency over an eight octave range.
- Resonance: rotary control, which varies the shape of the filter's response, from pure lowpass to actual oscillation.
- Envelope Amount: rotary control, which adjusts the amount that the input signal's envelope sweeps the filter cutoff frequency.
- Mix: rotary control, which crossfades continuously from unfiltered to filtered audio.
- Drive: rotary control, which adjusts the gain of the audio input.
- Smooth-Fast: rocker switch, which chooses between smooth and fast envelope follower response.
- 2 Pole-4 Pole rocker switch, which chooses between 2-pole (bright) and 4-pole (deep) filter frequency response.
- Level: a three-color LED that is used to set the DRIVE control.
- Env: a LED that indicates the strength of the envelope voltage.
- Bypass: a two-color LED that tells whether the filter is on or bypassed.
- On Bypass: a rugged, smooth-acting 'stomp switch.'
Other Specs
- Power supply is included: order 110v for use in US or Canada
- 220v available by special order.
- Dimensions: 9" x 6" x 2-1/2"
Tech Notes
A lowpass filter removes high frequencies
from a tone. It makes the tone sound more mellow or muted. The lower
the cutoff, the more muted the tone sounds. Imagine a window shade. As
it is pulled down, it cuts out the higher light, then the light from
the middle of the window, then finally all the light. A lowpass filter
does the same sort of thing to the sound spectrum.
The envelope follower tracks the loudness
contour (envelope) of a sound, and produces a voltage that follows the
dynamics of your playing. Every time you play a note, the envelope
voltage goes up and then down. The harder you play, the higher the
envelope voltage goes. The envelope follower opens and closes the
lowpass filter. Think of the envelope voltage as an invisible hand that
turns the CUTOFF knob up and down every time you play a note. Since the
envelope follows the dynamics of your instrument's signal, you actually
"play" the filter as you play your instrument.
