Access virus os4 Manuale Utente

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12
 
CHAPTER 
 
3
 
Prologue
 
With the benefit of two external 
audio inputs, the Virus may also 
serve as an FX device and signal 
processor that you can use cre-
atively to come up with all kinds of 
effects. External signals can be 
processed with filter, gate and lo-fi 
effects, routed to the Virus effects 
section and serve as a modulation 
source for frequency and ring mod-
ulation.
Beyond that, you can use internal 
or external signals as sources for 
the Virus’ on-board vocoder serve. 
The vocoder works with up to 32 
filter bands and offers diverse 
manipulation and modulation 
options.
The three main oscillators produce 
66 waveshapes, three of which are 
dynamically mixable so that spec-
tral effects are possible within the 
confines of a single oscillator. In 
conventional synthesizers, this 
type of effect requires several oscil-
lators. Synchronization, frequency 
modulation and ring modulation 
between the audio oscillators 
delivers additional complex spec-
tral effects that you can use for all 
kinds of sound shaping purposes.
The filters can be switched in 
series or in parallel within the 
voices via several options. When 
you switch the filters in series, the 
saturation stage is embedded 
between the filters. Consequently, 
an overdriven filter resonance can 
be re-filtered within the same 
voice! A maximum of six filter 
poles (36 dB slope!) enables radical 
tonal manipulations. 
The LFOs feature 68 continuous 
variable waveshapes each, includ-
ing a triangle with variable sym-
metry and infinitely variable 
aperiodic oscillations for random 
variation of the controlled parame-
ters. The LFOs are capable of poly-
phonic as well as monophonic 
oscillation. In other words, if sev-
eral voices are active, the LFOs can 
run independently or in sync. A 
number of keyboard trigger 
options enable you start LFO wave-
shapes with variable phase lengths 
at the beginning of a note and/or 
to cycle once only, like an envelope.
Next to the numerous ”hard-
wired” or fixed modulation config-
urations, you can assign three 
modulation sources to up to six 
different modulation destinations