Access Virus TI, Руководство пользователя

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24
The Filters Section
In comparison with “Dr.What?”, the few sounds you have been
asked to create so far have been primitive and harsh. In sub-
tractive synthesizers such as the Virus, the tonal quality of the
oscillators can be radically altered by sending them through fil-
ters.
There are two main filters in your Virus, but before learning how
to access them individually, let’s start by experimenting with
the three parameters you will find on any subtractive synthe-
sizer: CUTOFF, RESONANCE and ENV AMOUNT (as it is
called in the Virus):
CUTOFF
Restore ROM-A127. Vary the CUTOFF while playing notes on
your keyboard. At low values, even medium frequencies are fil-
tered out – the sound is very mellow.
As you turn CUTOFF up, higher frequencies are allowed to
pass through the filters, until the sound becomes brightest at
maximum CUTOFF. This is typical of lowpass (LP) filters, one
of the four basic types available in the Virus.
You have actually been using two lowpass filters in series here
– in ROM-A127 they have been configured to appear as just
one “double-strength” filter – we will come to the responsible
parameter (“Routing”) shortly.
RESONANCE
RESONANCE emphasizes any frequencies close to the cutoff
position. Play a note and sweep CUTOFF as you did just now,
then turn up RESONANCE and try again. At higher
RESONANCE values, the cutoff frequency becomes quite
dominant. You should be able to hear individual harmonics
being picked out if you turn CUTOFF slowly enough. If you like,
go back to program ROM-A 26 and try a lot more
RESONANCE.
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