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IOUS - User Manual
Stereo control
Width
Each partial of a waveform can furthermore be spread of the stereo space. This is
controlled through the waveform's “width” parameter. A zero width gives a very narrow
sound (the default) whereas set to 100, partials are balanced across the entire stereo
space.
Pan
Like the name suggests, this is the parameter used to offset the center of the waveform in
the stereo space.
Quality Settings
Additive synthesis can be very CPU hungry on low end computers, depending on the
number of partials manipulated and the rate at which they are modified. These settings let
you strike a balance between quality and CPU performance or just push the quality to its
maximum.
Partial Count
By setting the partial count to one of the three possible settings – Low, Medium or High –
you can lessen the CPU load of your patches. Each quality setting corresponds to a
certain number of partials per voice, which affects the spectrum of the waveforms.
Precision
On most occasions you won't notice a difference when changing the precision but when
you are changing your spectrum at a very fast rate (with a high rate LFO for instance or a
high rate noise modifier) you might want to try a higher setting. If, on the contrary, you are
creating a very slowly evolving pad, you can switch to the low setting without noticing any
difference. Changing the spectrum includes modifiers and filters so very fast modulation of
filter cutoff can also be of higher quality if you push this setting to its highest value.
Display
When all partial modifiers are turned off (the default situation), the partial display lets you
visualize the levels (in dB) and pitches of the selected wave form's partials. Due to a
limited display size only the partials with pitches up to hundred times the fundamental
frequency will fit in the display. Nonetheless, especially in high quality extra partials can
exist after the far right of the visible spectrum.
If all the partials are harmonics (for instance with a saw tooth or square wave), the pitch
display will be empty. If this is not the case, inharmonic partials will display a bar with an
amplitude indicating its distance to the nearest harmonic in cents. If multiple partials
overlap on the display (with very similar pitches), the partial with the greatest deviation
from the harmonic will be used to display this pitch.
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