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SUBTRACTOR SYNTHESIZER

103

Noise Generator

The Noise Generator could be viewed as an oscillator that produces noise in-

stead of a pitched waveform. Noise can be used to produce a variety of sounds,

the classic example being “wind” or “rolling wave” sounds, where noise is

passed through a filter while modulating the filter frequency. Other common ap-

plications include non-pitched sounds like drums and percussion, or simulating

breath noises for wind instruments. To use the Noise Generator, select an Init

Patch and proceed as follows:

1. Turn Osc 2 off.

2. Click the button (in the Noise Generator section) to activate the

Noise Generator.

If you play a few notes on your MIDI instrument you should now hear Osc1

mixed with the sound of the Noise Generator.

3. Turn the Mix knob fully to the right, and play a few more notes.

Now just the Noise Generator will be heard.

D Thus, the output of the Noise Generator is internally routed to Osc

If you switch Osc 2 on, the noise will be mixed with the Osc 2 waveform.

There are three Noise Generator parameters. These are as follows:

Phase Offset Modulation

A unique feature of the Subtractor oscillators is the ability to create an extra

waveform within one oscillator, to offset the phase of that extra waveform, and to

modulate this phase offset. By subtracting or multiplying a waveform with a

phase offset copy of itself, very complex waveforms can be created. Sounds

complicated? Well, the theory behind it might be, but from a user perspective it

is just a method of generating new waveforms from existing waveforms.

A seasoned synth programmer using Subtractor for the first time may wonder

why the Subtractor oscillators (seemingly) cannot provide the commonly used

pulse waveform and the associated pulse width modulation (PWM). Or oscilla-

tor sync, another common feature in analog synthesizers. The simple answer is

that Subtractor can easily create pulse waveforms (with PWM) and oscillator

sync-sounds, and a lot more besides, partly by the use of phase offset modula-

tion.

Each oscillator has it's own Phase knob and a selector button. The Phase knob

is used to set the amount of phase offset, and the selector switches between

three modes:

• Waveform multiplication (x)

• Waveform subtraction (–)

• No phase offset modulation (o).

| Parameter | Description

Noise Decay This controls how long it takes for the noise to fade out when

you play a note. Note that this is independent from the Amp

Envelope Decay parameter (see page 110), allowing you to

mix a short “burst” of noise at the very beginning of a sound,

i.e. a pitched sound that uses oscillators together with noise.

Noise Color This parameter allows you to vary the character of the noise. If

the knob is turned fully clockwise, pure or “white” noise

(where all frequencies are represented with equal energy) is

generated. Turning the knob anti-clockwise produces a grad-

ually less bright sounding noise. Fully anti-clockwise the noise

produced is an earthquake-like low frequency rumble.

Level Controls the level of the Noise Generator.

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 297 298

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Propellerhead Reason Spécifications Page 105

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