Moog-music Minimoog Voyager Performer Edition User Manual download pdf (Page 24)

Page 26

Voyager User’s Manual - The Components

Page 27

Voyager User’s Manual - The Components

Filter Section Controls:

Cutoff:

The CUTOFF knob is the main lter control. This sets the cutoff frequency of both of the lters in the both

Dual Lowpass and Highpass/Lowpass mode.

In Dual Lowpass mode, the frequencies to the right of the indicator on the knob are the frequencies that

are ltered out. The frequencies to the left of the indicator are the frequencies that are allowed to pass

through the lter. This is why as you turn the control clockwise the cutoff frequency becomes higher and

the sound becomes brighter. Of course to hear the effect of a lowpass lter it helps to have a signal rich

in harmonics which provides high frequencies to lter. A good example of a sound rich in harmonics is a

sawtooth waveform.

In Highpass/ Lowpass mode, the combination of highpass and lowpass lters forms a bandpass lter. The

CUTOFF control changes the center frequency of the passband.

Spacing:

The SPACING control is used to determine the difference between the cutoff frequencies of the two lters

in both Dual Lowpass mode and Highpass/ Lowpass mode. The numbers on the legend around the knob

refer to octaves. When the SPACING control is centered, the cutoff frequencies of the two lters are

identical and the lter sounds like a classic Moog Filter. Setting the SPACING control to +1 in Dual Lowpass

mode means that the right lter has a cutoff frequency equal to where the CUTOFF control knob is set,

and the left frequency has a cutoff frequency that is one octave higher than the right lter. This means when

the CUTOFF control is swept, two resonant peaks are heard, giving the lter a unique quality.

In Highpass/Lowpass mode, the SPACING control sets the difference between the cutoff frequencies by

shifting the highpass lter’s cutoff frequency up or down. When the SPACING control is fully clockwise, the

cutoff frequencies of the two lters are the same, making for a very narrow bandpass lter.

Resonance:

The RESONANCE control causes feedback in the lter circuit that adds harmonic emphasis at the cutoff

frequency. This control affects the lowpass lters in either lter mode, but not the highpass lter. When the

RESONANCE control is all the way down, the lowpass lters act as a tone control, rolling off high end as

the CUTOFF control is turned down. As the resonance increases, the lter begins to form a peak at the

cutoff frequency. Harmonic content within the frequency range of this resonant peak is emphasized, and the

sound takes on a vocal-like quality. As the RESONANCE control is turned up the peak increases in strength

until the control is set to 8 or higher, when the lter begins to self-oscillate – creating sine waves with the

same frequency as the cutoff frequency.

Keyboard Control Amount:

The KEYBOARD CONTROL AMOUNT knob allows the lter cutoff to follow the key played on the

Voyager keyboard (or the keyboard controlling the Voyager RME). A higher key will cause a higher cutoff

frequency. This allows a sound to retain its brightness as it is played higher on the keyboard.

Mode:

The lter MODE switch selects either the dual lowpass conguration (DUAL LP) or the highpass/lowpass

conguration (HP/LP).

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Moog-music Minimoog Voyager Performer Edition User Manual Page 24

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