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As this kind of effect coupling rather unusual, we are going to have a close look now at two examples,
the first one being a 'Spatial EQ', and the second a 'Spatial Vibrato'.
Example 1: Spatial EQ
A Spatial EQ is actually the lower second-order peaking filter in Equalizer window, whose gain, quality
factor and frequency parameters are adjusted according to source movement. In the present example, we
wish to couple 1. filter central frequency to source azimuth, 2. gain to distance, and 3. quality factor Q to
speed. Note that this is just an example, and we could couple parameters in a completely different
fashion, or couple only one or two of them and leave the remaining constant (a spatial effect with all
coupling knobs set to Off is identical to a traditional effect – all parameters are constant).
There are 2 Spatial Effects windows, one for each channel. In order to set a spatial EQ on channel 1, you
first need to select EQ in Spatial Effects – Channel 1 window, as illustrated below.
In this current example, we couple EQ peaking frequency to source 1 azimuth relative to listener. This
means that EQ peaking frequency will be automatically adjusted when source 1 turns about the listener.
To achieve this, position Coupling knob on Azimuth, as illustrated.
With the Range control, set the bounds for frequency sweeping. When the source moves
about the listener, the filter central frequency will sweep the Range interval, between these
two limits.
Use the second control to adjust for what azimuth should the maximum frequency value
occur. The minimum frequency will occur at the diametrically opposite direction.
Eventually, there's yet another switch allowing you to select between linear (Lin) or
logarithmic (Log) sweeps. The figure on next page compares how the parameter will change
for both laws. Logarithmic law is especially suitable for frequency sweeps – it generates a
constant speed sweep on the logarithmic frequency scale of EQ graph.
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Wrocław Audio Force
22
ORFEUSZ206
user manual
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