"LFO" means Low Frequency Oscillator.
Theese oscillators are not used to make sounds by themselves, but they
changes somes parameters (like the frequencies, the amplitudes or the
The LFOs has some basic parameters:
- Delay : This parameter
sets how much time takes since the start of the note to the start of
- When the LFO starts, it has a certain position called Start Phase
- Frequency: how fast the
LFO is (i.e. how fast the parameter's controlled by the LFO changes)
- Depth : the amplitude of
the LFO (i.e. how much the parameter's controlled by the LFO changes)
Another important LFO parameter is the shape. There
are many LFO Types according
to the shape. ZynAddSubFX supports the folowing LFO shapes:
Another parameter is the LFO Randomness. It modifies the LFO
amplitude or the LFO frequency at random. In ZynAddSubFX you can choose
how much the LFO frequency or LFO amplitude changes by this parameter.
In the folowing images are shown some examples of randomness and how
changes the shape of a triangle LFO.
Other parameters are:
- Continous mode - If this
mode is used, the LFO will not start from "zero" on each new note, but
it will be continuous. This is very usefull if you apply on filters to
make interesting sweeps.
- Stretch - It controlls
how much the LFO frequency changes according to the note's frequency.
It can vary from negative stretch
(the LFO frequency is decreased on higher notes) to zero (the LFO frequency will be the
same on all notes) to positive
stretch (the LFO frequency will be increased on higher notes).
In ZynAddSubFX, LFO parameters are shown as:
Theese parameters are:
- Freq - LFO Frequency
- Depth - LFO Depth
- Start - LFO Start Phase - If this knob is at the lowest
value, the LFO Start Phase will be random.
- Delay - LFO Delay
- A.R - LFO Amplitude Randomnes
- F.R. - LFO Frequency Randomness
- C. - LFO Continous Mode
- Str. - LFO Stretch - in the image above the LFO
stretch is set to zero