Moog Music Recording Equipment MF-105 ユーザーズマニュアル

sound. Some types of filters (like the bass and treble controls on 

your sound system) have subtle, gentle effects on a sound’s timbre. 

Other types of filters have stronger and more dramatic effects, and 

are frequently used as vital elements in the music-making process. 

Strong filters include phasers, flangers, and wah-type resonant 

filters.

   A graph showing what a filter does is called the filter’s frequency 

response. The horizontal axis is frequency. The vertical axis is the 

filter’s gain.  A gain of “1” (unity) means that, at that frequency, the 

output of the filter is just as strong as the input. A gain of less than 

unity means that the filter’s output is attenuated at that frequency, 

while a gain of greater than unity means that the output is actually 

greater than the input. 

   Figure 4 shows examples of the frequency response 

characteristics of two common types of filters: (a) a lowpass filter, 

which passes frequencies without attenuation up to a so-called 

‘cutoff frequency’, and attenuates the frequencies above cutoff; (b) 

a resonant filter, which emphasizes frequencies around the filter’s 

‘center frequency’. 

  Both of these filter types are widely used in contemporary music 

performance. Each of them has its own distinct sound, a large part 

of which is directly related to the shape of its frequency response 

graph. The first type is embodied in the moogerfooger MF-101 

lowpass filter, and the second type is embodied in the MuRF.. 

There are eight separate resonant filters in your MF-105.