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CHAPTER 

14

The Parameters

indigo are also considered to be 
external MIDI controllers since 
they are not actually component 
parts of the sound generation sys-
tem).

The second type comprises the 
sound generation system’s internal 
modulators, for example, LFOs and 
envelopes. These also have fixed 
modulation assignments (LFO 
AMOUNT, ENV AMOUNT), but are 
freely available along with the 
Modulation Matrix.

Let’s take a look at the internal 
modulation sources:

 

AMPENV & FILTENV    The corre-

sponding envelope is the modula-
tion source.

 

LFO1, LFO2, LFO3    The corre-

sponding LFO is the modulation 
source.

 

VELOON    The note on velocity is 

the modulation source. 

 

VELOOFF    The note off velocity 

is the modulation source. Accord-
ing to the fact, that the note off 
velocity is only known when the 
key is released again, here, the 

VIRUS uses the note on velocity, 
when the key is held. Therefore 
both, note on- and off velocities, 
are active here.

 

KEYFLW    The note number 

respectively the pitch is used as 
the modulation source (Keyfollow)

 

RANDOM    A random number 

which remains for the whole dura-
tion of the note on, is used as
the modulation source here.
The control range of the source 
may be limited via the AMOUNT 
values or inverted so that the mod-
ulation occurs strictly within the 
desired value range for the target 
parameter. For your target param-
eters, you can chose from among 
virtually all sound parameters that 
feature an infinitely variable con-
trol range – ergo, you have more 
than 100 modulation destinations 
at your disposal.

If you haven’t selected a source for 
one of the ASSIGN options 
(SOURCE = OFF), the subordinate 
parameters will not be displayed.