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containing all the overtones of the harmonic series; the higher the frequency of the
overtone, the lower its amplitude is. This gives a bright and buzzy sound.
● AMPLITUDE SQR (0...127):
Adjusts the volume of the square wave. This waveform contains only the
odd-numbered overtones of the harmonic series. This gives a hollow sound.
● AMPLITUDE TRI (0...127):
Adjusts the volume of the triangle wave. This waveform also contains only the
odd-numbered overtones of the harmonic series but, as their frequencies increase,
their volumes taper off much more steeply than those in the square wave. This gives
a deep sound with a strong fundamental.
● AMPLITUDE VOLUME (0...127):
This is the master volume of the oscillator. Along with the individual waveform
amplitude sliders, this has an especially important role in the generation of foldover
distortion (see below).
● VCO TRANSPOSITION (-24...0...24):
Located immediately to the right of VCO1 in the editor. Transposes all oscillators
together in semitone steps.
showing already). Select a source VCO from the left side and the destination VCO(s) from
the right side, then press C OPY .
Foldover Distortion
A special feature of the FI is foldover distortion. Depending on the implemented algorithm,
when a signal processor is over l oaded it will either clip the peak of the signal or it will fold
over. While clipping is often used to generate a moderate amount of overtones, foldover is
practically never used since it generates such a high overtone content that the sound
becomes unusable due to out-of-tune aliasing artifacts. However, the huge processing
power of the FI allows the oscillators to be generated at an oversampling rate of 512 kHz,
guaranteeing that the aliasing portion of the sound remains negligible.
Foldover Distortion can happen in the FI either within a single oscillator or within a
combination of multiple oscillators.
Each individual waveform (saw, square or triangle) within an oscillator will drive the
summation to maximum amplitude by itself if set to 127. Foldover Distortion can happen
within this oscillator if the sum of all three of its wave f orms' amplitudes exceeds 127
(depending on the phase of the components).
There is a C OPY o ption in the lower left part of the
screen to copy all parameters of one oscillator to one
or more of the other oscillators. Click on the V CO
button to show the VCO checkboxes (if they aren't
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