Access virus indigo ii Manuale Utente
ACCESS VIRUS OS5
27
The Second Oscillator
(PW = pulse width) pot, PROVIDED THE SHAPE
POT IS SET TO A POSITION IN THE RIGHT
HALF OF ITS CONTROL RANGE (LATER THAN
12 O’CLOCK). Rotate the WAVE SEL/PW pot
slowly from the left to the right and leave the
SHAPE pot at the far right position. You can
hear how the treble content of the sound in-
creases while the sound becomes ever thinner.
At the far right position, the signal is no longer
audible because the pulse width is equivalent to
0% and consequently the wave no longer oscil-
lates.
POT IS SET TO A POSITION IN THE RIGHT
HALF OF ITS CONTROL RANGE (LATER THAN
12 O’CLOCK). Rotate the WAVE SEL/PW pot
slowly from the left to the right and leave the
SHAPE pot at the far right position. You can
hear how the treble content of the sound in-
creases while the sound becomes ever thinner.
At the far right position, the signal is no longer
audible because the pulse width is equivalent to
0% and consequently the wave no longer oscil-
lates.
Starting at the center position (12 o’clock) indi-
cated by the sawtooth, turn the SHAPE pot
counter-clockwise towards the left. You can
hear how the overtones are increasingly mixed
out of the signal until you can only hear the root
note. This sound is produced by a so-called
sine wave, one of 64 other waveshapes that
you have at your disposal for sound generation
purposes. These waveshapes can also be acti-
vated via WAVE SEL/PW (WAVE SEL: Wave Se-
lect), PROVIDED THE SHAPE POT IS SET TO A
POSITION IN THE LEFT HALF OF ITS CON-
TROL RANGE (EARLIER THAN 12 O’CLOCK).
Regardless of the current SHAPE setting, you
can also select a wave in the EDIT menu under
OSCILLATOR 1 WAVE.
cated by the sawtooth, turn the SHAPE pot
counter-clockwise towards the left. You can
hear how the overtones are increasingly mixed
out of the signal until you can only hear the root
note. This sound is produced by a so-called
sine wave, one of 64 other waveshapes that
you have at your disposal for sound generation
purposes. These waveshapes can also be acti-
vated via WAVE SEL/PW (WAVE SEL: Wave Se-
lect), PROVIDED THE SHAPE POT IS SET TO A
POSITION IN THE LEFT HALF OF ITS CON-
TROL RANGE (EARLIER THAN 12 O’CLOCK).
Regardless of the current SHAPE setting, you
can also select a wave in the EDIT menu under
OSCILLATOR 1 WAVE.
Go ahead and check out the different wave-
shapes. The second of the 64 waves is a trian-
gle wave, the remainder of the waveshapes are
each a unique tonal blend. After you have famil-
iarized yourself with this raw material, experi-
ment with the parameters of the FILTERS and
AMPLIFIER sections you have dealt with thus
far (don’t forget about SATURATION and the
corresponding function of the OSC VOL pot), to
get a feel for how the diverse waveshapes re-
spond to filtering, saturation and amplifier mod-
ifications.
shapes. The second of the 64 waves is a trian-
gle wave, the remainder of the waveshapes are
each a unique tonal blend. After you have famil-
iarized yourself with this raw material, experi-
ment with the parameters of the FILTERS and
AMPLIFIER sections you have dealt with thus
far (don’t forget about SATURATION and the
corresponding function of the OSC VOL pot), to
get a feel for how the diverse waveshapes re-
spond to filtering, saturation and amplifier mod-
ifications.
THE SECOND OSCILLATOR
As already mentioned above, the Virus has a
second oscillator (as well as several other basic
sound sources which will be described later in
this manual). Press the OSC 2 button in the OS-
CILLATORS section to enter the edit pages for
the oscillator 2. The controls in this section now
apply to oscillator 2 only – oscillator 1 parame-
ters cannot be changed now (although the os-
cillator can still be heard).
second oscillator (as well as several other basic
sound sources which will be described later in
this manual). Press the OSC 2 button in the OS-
CILLATORS section to enter the edit pages for
the oscillator 2. The controls in this section now
apply to oscillator 2 only – oscillator 1 parame-
ters cannot be changed now (although the os-
cillator can still be heard).
Dial in the basic sound program that you had at
the very beginning; change the amplifier enve-
lope to suit your taste. In the sound program,
the OSC BAL (Oscillator Balance) pot in the
MIXER section is preset to the far left. In order
to hear Oscillator 2 in action, rotate the OSC
BAL (Oscillator Balance) pot in the MIXER sec-
tion to the right. Towards the center position (12
o’clock) you will hear how the tone is modified
and as you rotate the pot further to the right,
how the intensity of this modification is re-
duced. This effect is known as the comb filter-
ing effect. It occurs when two signals with the
same frequency but different phase lengths are
mixed. Press the same key on your keyboard
several times with the OSC BAL set to the cent-
er position (12 o’clock). You should notice that
each note has a slightly different tone. The os-
cillators are the source of this effect. The oscil-
l a t o r s o f t h e V I R U S o s c i l l a t e f r e e l y,
consequently every time you play a note, the
phase constellation between the two oscillators
is different. For now, leave the OSC BAL POT at
the center position (12 o’clock).
the very beginning; change the amplifier enve-
lope to suit your taste. In the sound program,
the OSC BAL (Oscillator Balance) pot in the
MIXER section is preset to the far left. In order
to hear Oscillator 2 in action, rotate the OSC
BAL (Oscillator Balance) pot in the MIXER sec-
tion to the right. Towards the center position (12
o’clock) you will hear how the tone is modified
and as you rotate the pot further to the right,
how the intensity of this modification is re-
duced. This effect is known as the comb filter-
ing effect. It occurs when two signals with the
same frequency but different phase lengths are
mixed. Press the same key on your keyboard
several times with the OSC BAL set to the cent-
er position (12 o’clock). You should notice that
each note has a slightly different tone. The os-
cillators are the source of this effect. The oscil-
l a t o r s o f t h e V I R U S o s c i l l a t e f r e e l y,
consequently every time you play a note, the
phase constellation between the two oscillators
is different. For now, leave the OSC BAL POT at
the center position (12 o’clock).
You are already familiar with Oscillator 1’s
SHAPE and WAVE SEL/PW pots. These func-
tions are identical for Oscillator 2, so we won’t
go into detail on them again.
SHAPE and WAVE SEL/PW pots. These func-
tions are identical for Oscillator 2, so we won’t
go into detail on them again.