Propellerhead Reason - 4.0 Manual de operaciones descargar pdf (Pagina 190)

SUBTRACTOR SYNTHESIZER

188

Oscillator Keyboard Tracking

Oscillator 1 has a button named “Kbd. Track”. If this is switched off, the oscillator

pitch will remain constant, regardless of any incoming note pitch messages, although

the oscillator still reacts to note on/off messages. This can be useful for certain appli-

cations:

D When Frequency Modulation (FM - see page 190) or Ring Modulation

(see page 190) is used.

This produces enharmonic sounds with very varying timbre across the keyboard.

D For special effects and non-pitched sounds (like drums or percussion)

that should sound the same across the keyboard.

Using Oscillator 2

You activate Osc 2 by clicking the button next to the text “Osc 2“. Setting oscillator

frequency and keyboard tracking is identical to Oscillator 1.

Adding a second oscillator enables many new modulation possibilities which can pro-

duce richer timbres. A basic example is to slightly detune (+/– a few cents) one of the

oscillators. This slight frequency offset causes the oscillators to “beat” against each

other, producing a wider and richer sound. Also, by combining two different wave-

forms, and adding frequency or ring modulation, many new timbres can be created.

Oscillator Mix

The Osc Mix knob determines the output balance between Osc 1 and Osc 2. To be

able to clearly hear both oscillators, the “Osc Mix” knob should be set somewhere

around the center position. If you turn the Mix knob fully to the left, only Osc 1 will be

heard, and vice versa. [Command]/[Ctrl]-clicking the knob sets the Mix parameter to

center position.

Oscillator 2 Waveform

The waveform alternatives for Oscillator 2 are identical to those of Oscillator 1.

However, the Noise Generator provides a third sound generating source (in addition

to the two oscillators) in Subtractor, and could be regarded as an “extra” waveform for

Oscillator 2, as it is internally routed to the Oscillator 2 output. See below for a de-

scription of the Noise Generator.

Noise Generator

The Noise Generator could be viewed as an oscillator that produces noise instead of

a pitched waveform. Noise can be used to produce a variety of sounds, the classic ex-

ample being “wind” or “rolling wave” sounds, where noise is passed through a filter

while modulating the filter frequency. Other common applications 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 Gener-

ator.

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 2.

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:

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 194), 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 fre-

quencies are represented with equal energy) is generated. Turning

the knob anti-clockwise produces a gradually 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.

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