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VIRUS CLASSIC MANUAL 25
Introduction
the far right). When you set the FILTER BALANCE pot to the center position (12 o’clock) - as we
mentioned before - the two filters are routed in series, which means they respond as if they were a
single filter with 6 poles and consequently a great deal of slope. This is why the input signal is
trimmed substantially when you set the pot to this position.
Experiment with the diverse FILTER BALANCE positions to get a feel for the different degrees of
slope. Rotate the CUTOFF pot or activate the filter envelope (for both filters!) to hear the filters in
action.
The CUTOFF 2 pot is a special feature: It controls the cutoff frequency of the second filter, but is
subordinate to the CUTOFF pot located above it. In other words, at the center position (12 o’clock)
the manually selected frequency of Filter-2 is identical to that of Filter-1. When you rotate the pot to
the left the cutoff frequency level of Filter-2 is increased relatively to Filter-1, when you turn to pot to
the right the cutoff frequency level is decreased relatively. Now when you adjust the CUTOFF pot,
you adjust the cutoff frequency of both filters by the same measure! This feature lets you determine
a difference in values in the filter frequencies (called an offset) via the CUTOFF2 pot which remains
constant whenever you adjust the CUTOFF pot.
Yet another experiment in which you can come up new filtering characteristics that are typical of the
Virus:
Set the FILTER BALANCE pot to the center position (12 o’clock) and CUTOFF 2 to the maximum
level. The FILTER ROUTING operating mode must remain SER 6. Set CUTOFF and RESONANCE to
a middle value and select a clearly audible SATURATION curve.
Now you can filter this complex signal produced by a combination of the saturation stage and the
Filter-1 yet again. Rotate the CUTOFF 2 pot slowly towards the center position (12 o’clock). You can
hear how Filter-2 gradually modifies the distorted signal. You can set a RESONANCE value for Fil-
ter-2 if you press the FILT 2 SELECT button and rotate the RESONANCE pot to the desired position.
Set the CUTOFF 2 pot to a position to the right of the center position. This configuration can be
described as a complex non-linear filter set up where the cutoff frequency is controlled via the CUT-
OFF pot. You can dial in a wide range of sound-shaping option via CUTOFF 2. Also try modifying
the resonances of both filters as well as the SATURATION curve to come up with different filtering
characteristics.
Now experiment with the diverse filter modes and listen closely to the effect of the parameters RES-
ONANCE, ENV AMOUNT and KEY FOLLOW in conjunction with the SELECT button. Please also
keep in mind that the chances of choking a sound off are substantially greater when you are using
both filters: For instance, if the first filter is used as a low pass with a low cutoff frequency and the
second as a high pass with a high cutoff frequency, the Virus will not generate an audible signal
when you set the FILTER BALANCE pot to the center position (12 o’clock).