Propellerhead Reason Spécifications télécharger pdf (Page 194)

DR. REX LOOP PLAYER

192

LFO Section

LFO stands for Low Frequency Oscillator. LFOs are oscillators in the sense that

they generate a waveform and a frequency. However, there are two significant

differences compared to normal sound generating oscillators:

• LFOs only generate waveforms with low frequencies.

• The output of the two LFOs 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 gen-

erating) oscillator or sample, to produce vibrato. In the Dr.Rex device, you can

also use the LFO to modulate the filter frequency or panning.

Waveform

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

These are, from top to bottom:

Destination

The available LFO Destinations are as follows:

Sync

By clicking this button you activate/deactivate LFO sync. The frequency of the

LFO will then be synchronized to the song tempo, in one of 16 possible time di-

visions. When sync is activated, the Rate knob (see below) is used for setting

the desired time division.

Turn the knob and check the tooltip for an indication of the time division.

Rate

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

lation rate.

Amount

This parameter determines to what degree the selected parameter destination

will be affected by the LFO 1, i.e. the amount of vibrato, filter wah or auto-pan-

ning.

| Waveform | Description

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

Inverted

Sawtooth

This produces a “ramp up” cycle. If set to control pitch (fre-

quency), the pitch would sweep up to a set point (governed

by the Amount setting), after which the cycle immediately

starts over.

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

inverted.

Square This produces cycles that abruptly changes between two val-

ues, usable for trills etc.

Random Produces random stepped modulation to the destination.

Some vintage analog synths called this feature “sample &

hold”.

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

| Destination | Description

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

REX file.

Filter Selecting this makes the LFO control the filter frequency.

Pan Selecting this makes the LFO modulate the pan position of

the REX file, i.e. it will move the sound from left to right in the

stereo field.

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Propellerhead Reason Spécifications Page 194

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