Analogue-solutions Nyborg User Manual download pdf (Page 14)

VCF

The voltage controlled filter (VCF) is used

to alter the tone of the VCOs/Noise and is

the heart of what gives an analogue synth

its character.

The main character of the filter is a 2

pole, 12dB/Octave ‘oberheim’ style filter.

There are 4 types of filter available;

Low Pass

High Pass

Band Pass

Notch Pass (variable between Low/High)

FREQUENCY

This sets the cut-off frequency, the point

at which the filter begins operating and

will start to filter out harmonics.

RESONANCE

Resonance only acts at the filter cut-off

point. The effect amplifies the frequencies around the cut-off point. As the control is

increased to higher levels the filter will start to self-oscillate. Use Resonance to alter

the tone of the filter effect. It can be used to create squidgy sounds, pulse hits and

effects.

MODULATION AMOUNT

Turning the control clockwise will increase the amount that the modulation source

selected by the MOD.SOURCE switch (outlined below) will modulate the cut-off

frequency. Turning the control anti-clockwise works just like clockwise except that the

modulation signal is inverted (negative). In a central position the selected modulation

source will not affect cut-off modulation.

NOTCH

This sets the relative mix between the low pass and high pass filters that is fed to the

Filter Type selection switch

MOD SOURCE ROTARY SWITCH

This selects the modulation source that will affect the filter cut-off and is routed to the

control above.

There are 4 modulation sources;

EG1 EG1 is used as a modulation source. Use for tonal changes.

LFO LFO is used as a modulation source. Use for filter sweeps (wah-wah).

VCO2 Pulse wave of VCO2 is used as a modulation source. Use for effects.

EXT Signal at the EXT socket is used as a mod source. Use for external

filter control.

A VCF allows its cutoff

frequency and Q factor

(resonance at the cutoff

frequency), to be

continuously varied; the

signal outputs may include a

lowpass response, a

highpass response, a

bandpass response, and a

notch response. The filter

may offer a variable slope

which determines the rate of

attenuation outside the

bandpass, often at

6dB/octave, 12dB/octave (a

'2 pole' filter) or

24dB/octave (a '4 pole'

filter).

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Analogue-solutions Nyborg User Manual Page 14

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