Access virus os4 Manuale Utente
ACCESS VIRUS OS4
25
Filter Modulation
FILTER MODULATION
Of course we don’t want to require
you to execute every sound modifi-
cation manually by twiddling pots.
All kinds of sound modifications in
the Virus can be executed auto-
matically much in the way of your
previous experiments with the vol-
ume controls: The amplifier enve-
lope can be described as a variable
curve which, depending on the
type and duration of attack, hold
and release data, automatically
influences (turns it up or down) an
imaginary volume pot.
you to execute every sound modifi-
cation manually by twiddling pots.
All kinds of sound modifications in
the Virus can be executed auto-
matically much in the way of your
previous experiments with the vol-
ume controls: The amplifier enve-
lope can be described as a variable
curve which, depending on the
type and duration of attack, hold
and release data, automatically
influences (turns it up or down) an
imaginary volume pot.
Similar procedures are applicable
to the filter frequencies. The FIL-
TERS
to the filter frequencies. The FIL-
TERS
section features its own enve-
lope, the structure of which is
identical to the amplifier envelope,
located directly above the ampli-
fier envelope on the control fea-
ture panel. Much like the amplifier
envelope, the filter envelope auto-
matically “rotates” the CUTOFF
pot.
identical to the amplifier envelope,
located directly above the ampli-
fier envelope on the control fea-
ture panel. Much like the amplifier
envelope, the filter envelope auto-
matically “rotates” the CUTOFF
pot.
However there is one significant
difference between the two enve-
lopes. With the amplifier envelope,
you are always dealing with an ini-
difference between the two enve-
lopes. With the amplifier envelope,
you are always dealing with an ini-
tial volume level of 0 because of
course you want absolute silence
prior to the beginning of a note.
After the RELEASE phase, it is again
highly desirable that your box is
silent. With the filter envelope, the
situation is somewhat different: It
always starts at the CUTOFF value
that you determined manually.
And it is definitely not always
desirable that the filter frequency
is brought to the maximum level.
course you want absolute silence
prior to the beginning of a note.
After the RELEASE phase, it is again
highly desirable that your box is
silent. With the filter envelope, the
situation is somewhat different: It
always starts at the CUTOFF value
that you determined manually.
And it is definitely not always
desirable that the filter frequency
is brought to the maximum level.
Consequently, you need a tool that
limits the effective range of the fil-
ter. This is why we equipped the
Virus with a control labeled ENV
AMOUNT
limits the effective range of the fil-
ter. This is why we equipped the
Virus with a control labeled ENV
AMOUNT
(short for Envelope
Amount). When the pot is turned
counter-clockwise to the far left,
the filter has no effect on the cut-
off frequency; the further you turn
the pot to the right, the greater
the effect the filter envelope has
on the filter frequency. The maxi-
mum level of the envelope may lie
outside the audible range when
the filter has already been partially
opened via the CUTOFF pot or was
manipulated via other control
options. In extreme cases where
the filter is already completely
counter-clockwise to the far left,
the filter has no effect on the cut-
off frequency; the further you turn
the pot to the right, the greater
the effect the filter envelope has
on the filter frequency. The maxi-
mum level of the envelope may lie
outside the audible range when
the filter has already been partially
opened via the CUTOFF pot or was
manipulated via other control
options. In extreme cases where
the filter is already completely