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ACCESS VIRUS OS4
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lator signal conventionally with 
the first filter, distort the signal, 
and process the distorted signal 
via the second filter as you see fit.
The Effects section of the Virus fea-
tures a further distortion module 
called DISTORTION. Its design is 
largely identical to that of the SAT-
URATION
, except for one major dif-
ference: whereas SATURATION 
affects each voice separately, DIS-
TORTION processes all voices col-
lectively in the effects section. This 
makes a huge difference in tone.
Let’s take look at the SATURATION 
modes:
 
OFF    The signal is not processed.
 
LIGHT, SOFT, MIDDLE, HARD    
Different analog distortion curves 
with different characteristics and 
intensities. 
 
DIGITAL    Digital distortion with 
hard clipping. 
 
SHAPER    Sine characteristic 
curve with several wave cycles. 
With the Shaper, you can drasti-
cally warp signals. In some cases, 
the results are similar to the spec-
tra of linear frequency modula-
tions.
 
RECTIFIER    Continuous rectifica-
tion of the signal; this type of dis-
tortion is independent of the given 
level.
 
BITREDUCER    Continuous reduc-
tion of the digital signal’s bit 
depth; generates digital quantiza-
tion noise.
 
RATEREDUCER    Continuous 
reduction of the digital sampling 
rate; generates digital aliasing. 
 
RATE+FLW    The RateReducer 
with keyfollow; the sampling rate 
follows the played pitch.
 
LOWPASS    1-pole low-pass filter 
for moderate processing of high 
frequencies. 
 
LOW+FLW    The low-pass filter 
with keyfollow; the cutoff fre-
quency follows the played pitch.
 
HIGHPASS    1-pole high-pass fil-
ter for moderate processing of low 
frequencies.