Propellerhead Reason - 1.0.1 Instrukcja Operacji Pobierz pdf (Strona 114)

SUBTRACTOR SYNTHESIZER

112

LFO Section

LFO stands for Low Frequency Oscillator. LFO:s are oscillators, just like Osc

1 & 2, in that they also generate a waveform and a frequency. However,

there are two significant differences:

• LFO’s only generate waveforms with low frequencies.

• The output of the two LFO’s are never actually heard. Instead they

are used for modulating various parameters.

The most typical application of an LFO is to modulate the pitch of a (sound

generating) oscillator, to produce vibrato. Subtractor is equipped with two

LFO’s. The parameters and the possible modulation destinations vary some-

what between LFO 1 and LFO 2.

LFO 1 Parameters

Waveform

LFO 1 allows you to select different waveforms for modulating parameters.

These are (from top to bottom):

Destination

The available LFO 1 Destinations are as follows:

Rate

The Rate knob controls the LFO’s frequency. Turn clockwise for a faster

modulation rate.

Amount

This parameter determines to what degree the selected parameter destina-

tion will be affected by LFO 1. Raising this knob’s value creates more drastic

results.

Waveform

Description

Triangle This is a smooth waveform, suitable for normal vibrato.

Inverted Saw-

tooth

This produces a “ramp up” cycle. If applied to an oscillator’s

frequency, the pitch would sweep up to a set point (gov-

erned by the Amount setting), after which the cycle immedi-

ately starts over.

Sawtooth This produces a “ramp down” cycle, the same as above but

inverted.

Square This produces cycles that abruptly changes beween two val-

ues, usable for trills etc.

Random Produces random stepped modulation to the destination. On

some vintage synths, this is called “sample & hold”.

Soft Random The same as above, but with smooth modulation.

Destination

Description

Osc 1&2 Selecting this makes LFO 1 control the pitch (frequency) of

Osc 1 and Osc 2.

Osc 2 Same as above, but for Osc 2.

Filter Freq Selecting this makes the LFO 1 control the filter frequency

for Filter 1 (and Filter 2 if linked).

FM Selecting this makes the LFO 1 control the FM Amount pa-

rameter. Both oscillators must be activated for this to have

any effect.

Phase Selecting this makes the LFO 1 control the Phase Offset

parameter for both Osc 1 and 2. Note that Phase Offset

Modulation (Subtraction or Multiplication) must be acti-

vated for this to have any effect (see page 103).

Osc Mix Selecting this makes the LFO 1 control the oscillator Mix

parameter.

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