User Guide

Chapter 28 Sculpture 477
Filter Type Buttons
The five buttons at the bottom of the filter section determine the filter mode. Choices
are:
 Hipass: Allows frequencies above the cutoff frequency to pass. As frequencies below
the cutoff frequency are suppressed, it’s also known as a low cut Filter. The slope of
the filter is 12 dB/octave in Highpass mode.
 Lowpass: Allows frequencies which fall below the cutoff frequency to pass. As
frequencies above the cutoff frequency are suppressed, it’s also known as a high cut
filter. The slope of the filter is 12 dB/octave in Lowpass mode.
 Peak: This mode allows for an increase in level of a frequency band, the width of
which is controlled by the Resonance parameter.
 Bandpass: In this mode, only the frequency band directly surrounding the cutoff
frequency can pass. All other frequencies are cut. The Resonance parameter controls
the width of the frequency band that can pass. The bandpass filter is a two-pole filter
with a slope of 6 dB/octave on each side of the band.
 Notch: In this mode, the frequency band directly surrounding the cutoff frequency is
cut. All other frequencies are allowed to pass. The Resonance parameter controls the
width of the frequency band that is cut.
Cutoff (Morphable)
Determines the filter cutoff frequency. As an example of its use: In a lowpass filter, all
frequency portions above the cutoff frequency are suppressed, or cut off, hence the
name. The cutoff frequency controls the brilliance of the signal. The higher the cutoff
frequency is set, the higher the frequencies of signals that are allowed to pass through
the lowpass filter.
Resonance (Morphable)
Sets the filter resonance value:
 For highpass and lowpass modes, the Resonance parameter emphasizes the portions
of the signal which surround the frequency—as defined by the Cutoff value.
 In Peak, Notch, and Bandpass modes, Resonance controls the bandwidth.
Key
This knob adjusts the key tracking of the cutoff frequency. Put plainly, the further up/
down the keyboard you play, the more bright/mellow the sound becomes. Put more
technically, the cutoff frequency is modulated by keyboard position.
 A value of 0.0 disables key tracking.
 A value of 1.0 allows the cutoff frequency to proportionately follow the fundamental
of the note across the entire keyboard range.