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fIlterS 1 anD 2

The UltraNova has two identical ilter sections, which modify the harmonic content of the
oscillators’ outputs. They can be thought of as elaborate tone controls, with the additional
ability of being dynamically controllable by other parts of the synth. Pressing the

FILTER

button [13] opens the Filter Menu, which has two pages for each ilter. One of the

SELECT

buttons and one of the

PAGE

buttons will be illuminated, indicating that more than one

ilter is available to be controlled and that further menu pages are available. A total of 12
parameters per ilter is displayed for adjustment, eight on Page 1, four on Page 2. Note that
those on Page 2 are common to both ilters, and these appear whichever ilter is selected.
Note that it is possible to use the two ilter blocks together, placing them in various series/
parallel conigurations, by adjustment of the common parameter

Filter Routing

Per-ilter parameters (Page 1)

Filter 1 is used as the example in the descriptions which follow, but the two are identical in
operation.

RE1: Filter frequency

Displayed as:

F1Freq

Initial value:

127

Range of adjustment:

0 to 127

This parameter sets the frequency at which the ilter type selected by

RE5

operates. In the

case of hi-pass or low-pass ilters, it is the “cut-off” frequency; for band-pass ilters, it is the
“centre” frequency. Sweeping the ilter manually will impose a “hard-to-soft” characteristic
on almost any sound.

If Filter Frequency Link is set On (see Filter Menu page 2,

RE3

, below),

RE1

assumes a different function in the case of Filter 2 only:

RE1

: Filter 2 frequency offset

Displayed as:

Fq1<>Fq2

Initial value:

+63

Range of adjustment:

-64 to +63

See page 18 for more info

RE2: Filter resonance

Displayed as:

F1Res

Initial value:

Range of adjustment:

0 to 127

This parameter adds gain to the signal in a narrow band of frequencies around the frequen-
cy set by

RE1

. It can accentuate the swept-ilter effect considerably. Increasing the reso-

nance parameter is very good for enhancing modulation of the cut-off frequency, creating a
very edgy sound. Increasing Resonance also accentuates the action of the Filter Frequency
parameter, so that as the Filter knob is moved, a more pronounced effect is obtained.

If Filter Resonance Link is set On (see Filter Menu page 2, RE4, below), RE2
assumes a slightly different function.
RE1: Filter 1 & 2 Resonance
Displayed as:

F1&F2Res

Initial value:

Range of adjustment:

0 to 127

RE3: Filter control by Envelope 2

Displayed as:

F1Env2

Initial value:

Range of adjustment:

-64 to +63

The ilter’s action may be triggered by Envelope Generator 2. Envelope 2’s own menu pro-
vides comprehensive control over precisely how this shape of the envelope is derived, see
page 21.

RE3

lets you control the “depth” and “direction” of this external control; the higher

the value, the greater the range of frequencies over which the ilter will sweep. Positive and
negative values make the ilter sweep in opposite directions, but the audible result of this
will be further modiied by the ilter type in use.

RE4: Filter tracking

Displayed as:

F1Track

Initial value:

127

Range of adjustment:

0 to 127

The pitch of the note played can be made to alter the cut-off frequency of the ilter. At the
maximum value (127), this frequency moves in semitone steps with the notes played on
the keyboard – i.e., the ilter tracks the pitch changes in a 1:1 ratio (e.g., when playing two

notes an octave apart, the ilter cut off frequency will also change by one octave). At mini-
mum setting (value 0), the ilter frequency remains constant, whatever note(s) are played
on the keyboard.

RE5: Filter type

Displayed as:

F1Type

Initial value:

LP24

Range of adjustment:

See table at page 44

The UltraNova ilter sections offer 14 different types of ilter: four hi-pass and four low-pass
(with different slopes), and 6 band-pass ilters of various types. Each ilter type differenti-
ates between frequency bands in a different way, rejecting some frequencies and passing
others, and thus each imposes a subtly different character on the sound.

RE6: Distortion Amount

Displayed as:

F1DAmnt

Initial value:

Range of adjustment:

0 to 127

The ilter section includes a dedicated distortion generator; this parameter adjusts the
degree of distortion treatment applied to the signal. The basic ‘type’ of distortion added is
set by

RE7

(see below). The distortion is added pre-ilter (but see below).

Filter Distortion is always added before the ilter, and therefore the ilter frequency
affects the amount of distortion you hear. If you want to ilter your sound before it
is distorted, try settings similar to the following:

PARAMETER

VALUE

Frouting

Series

Fbalance

127

F1DAmnt

F2Damnt

As required

RE7: Filter Distortion Type

Displayed as:

F1Dtype

Initial value:

Diode

Range of adjustment:

See Page 31

The distortion generator for each ilter is located immediately before the ilter section itself.
The type of distortion generated can be selected with the

Distortion Type

parameter.

RE8: Filter Q Normalisation

Displayed as:

F1Qnorm

Initial value:

Range of adjustment:

0 to 127

This parameter alters the bandwidth of the peak created by the resonance control

F1Res

The value of

F1Res