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9. THE LOW FREQUENCY OSCILLATORS
A Low Frequency Oscillator (LFO) is an oscillating and periodic control signal that is
applied to parameters or other signals. At very slow rates, an LFO causes gradual changes
depending on the waveform or more drastic ones; the nature of these changes can take on
a very different character.
9.1. LFO parameters
The front panel controls in the LFO section are the following :
• Select/Edit either chooses LFO 1 or LFO 2 for editing, with a white LED showing
which one you're working on at the moment. Shift-clicking accesses the LFO Edit
function, which we'll describe in detail below.
• Rate/Trig sets the LFO rate. If you click the encoder, the Sync turns on and off to
indicate whether the LFO rate is set to a specific time value, or if it's locked to the
beat of the MiniFreak's Tempo setting. Shift-clicking lets you select how the LFO is
triggered to start the beginning of its wave cycle. We'll get into that in a moment.
• Wave/Load lets you choose the LFO waveform. Shift-turning this knob lets you
load a complex waveshape from an internal library of selections (with 16 factory
+ 8 user waveforms).
9.1.1. The LFO display LEDs
Directly above the Wave/Load knob is a pair of LEDs that flash at the rates of the two LFOs,
with color changes that hint at the wave shape.
To understand why this is such an important visual reference, we need to understand that
there are two ways in which an LFO can affect the signal:
• a
bipolar
LFO's waveform is centered around 0, and cycles through both positive
and negative values.
• a
unipolar
LFO's waveform can't go any lower than 0, and only creates positive
modulation throughout its cycle.
The LEDs reflect this: Yellow indicates a positive signal at any given moment, and Red
indicates a negative signal. If a signal spends any time at 0, its LED will go dark.
LFO controls
57 Arturia - User Manual MiniFreak - The Low Frequency Oscillators
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