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ACCESS VIRUS OS4
41
The LFOs
Now we can go on and solve the 
mysteries of the signal flow as 
determined by the FILTER ROUTING 
operating mode SPLIT: Here Oscil-
lator 1 and the SubOscillator are 
routed to Filter-1, whereas Oscilla-
tor 2 and the Noise Generator are 
routed to Filter-2. Although the 
sound sources are split into two 
signal paths, you can still control 
the volume levels of the different 
elements as well as OSC VOL in the 
usual manner.
THE LFOS
When you first started this series 
of experiments with sounds, we 
promised that many of the func-
tions the Virus can be “pro-
grammed” so that they are 
executed automatically. You have 
already learned how to control the 
volume and cutoff frequencies of 
both filters as well as the pitch and 
intensity of the frequency modula-
tion of Oscillator 2 via “prepro-
grammed” envelopes. These 
options are great, but you have 
already encountered a number of 
functions where it would be a 
helpful if you could also program 
them to be executed automati-
cally.  And of course envelopes are 
great modulation sources, but you 
have to play a note every time you 
want to initiate an envelope. Dur-
ing your experiments you probably 
came across a function or two you 
would like to be able to control 
periodically - independently of 
notes. Some features that come to 
mind are traditional techniques 
such as vibrato (periodic pitch con-
trol) and tremolo (periodic volume