Manualshelf

12.25

ManualsBrandsPropellerhead Reason ManualsApplicationsReason
711712713714715716717718719720
Table Of Contents
DR. OCTO REX LOOP PLAYER715
LFO section
LFO stands for Low Frequency Oscillator. LFOs are oscillators in the sense that they generate a waveform and a fre-
quency. 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 generating) oscillator or sample, to pro-
duce vibrato. In the Dr. Octo 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 the SYNC 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 divisions. When sync is activated, the Rate knob (see below) is used for
setting the desired time division.
|
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 (frequency), 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 values, 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.