User Guide / Owners Manual

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THE FILTERFREAK CONTROL PANEL

The Resonance control works in conjunction with the Frequency knob

and greatly enhances the effect of the lter by boosting the harmonics

that are located close to the Frequency setting. As you change the

frequency of the lter, the harmonics close to the cutoff frequency are

exaggerated, “picked out”, and become more pronounced. This gives

the lter that squeaky, wheezy sound. Cranking the Resonance control

all the way up will drive FilterFreak into oscillation (it will actually create

a signal): responding in the same manner as hardware analog lters

would. FilterFreak is capable of all the lter squeal, screech, and wiggle

you expect.

A Word of CAUTION: extreme Resonance settings can create VERY high

signal levels, high enough to cause damage to speakers if the volume is

high enough. You may want to turn down the output level of FilterFreak

before experimenting with any high resonance values.

RESONANCE

FilterFreak — Version 5

The Mod control is key to controlling the “depth” or amount of

modulation applied to the lter’s frequency. The higher the Mod knob

setting, the greater the modulation depth and the greater the lter

sweep. The lower the Mod setting, the lower the amount of sweep or

modulation. Keep in mind that how the lter is swept will be based on

the type of modulation signal selected.

MOD

The Shape control allows you to select the type of lter to be applied

to the signal and comes in four distinct avors: “LPF” (Lowpass), “BPF”

(Bandpass), “HPF” (Highpass) and “BRF” (Band Reject / Notch Filter).

If you’re not already familiar with the shape types we will discuss each

next. However, the best way to understand how the different lter

shapes sculpt sounds is to run some audio though FilterFreak, select

and adjust each shape, and listen to the changes.

The shape of the lter will be shown to the right of the control

graphically in the Filter Response Display.

SHAPE

LPF - LOWPASS FILTER

The Lowpass Filter shape will remove or reduce any harmonics above

the selected Frequency setting. This type of lter shape is very common

and is used in most synths and effects.

The Minimoog® made use of a 24db per octave lowpass lter, allowing

resonance to be boosted without losing too much low-end info. The

sound is unmistakable once you hear it.