Access Virus Rack XL User Manual page 62

62
CHAPTER 7
The Parameters
FM AMOUNT
Controls the frequency modulation intensity of
the second oscillator by the first. Depending on
the selected FM AMOUNT and the interval be-
tween the oscillators, the frequency modulation
generates everything from slightly to radically
enriched spectra. In the Virus you have the op-
tion of combining the two functions called oscil-
lator synchronization (SYNC) and frequency
modulation (FM AMOUNT) to generate new har-
monic spectra. The characteristics of the fre-
quency modulation can be modified with the
FM Mode parameter (in the OSCILLATOR EDIT
menu). You may also select an external audio
signal and have Oscillator 2 modulate its fre-
quency.
01111111111111111112
1 OSCILLATOR2
FmAmt
61111111111111111154
FM MODE
Oscillator 2's frequency modulation can be exe-
cuted in a variety of ways using a different sig-
nal or modulation sources. You can also select
an external audio signal for frequency modula-
tion. Set the intensity of the modulation via the
FM AMOUNT knob. Choose the sine wave for
Oscillator 2 in order to achieve the most trans-
parent form of frequency modulation. Here's a
look at the FM sources that you have at your
disposal:
01111111111111111112
1 OSCILLATOR 2
FmMode
61111111111111111154
- POSTRI One-way FM with a positive triangle
generated by Osc1.
22≤
PosTri≤
- TRI Linear FM with a bipolar triangle gener-
ated by Osc1.
- WAVE The selected Osc1 wave is the FM
source. This lets you in some cases create
typical DX7-FM sounds (here OSCILLATOR 1
SHAPE should be set to WAVE).
- NOISE The noise generator is the FM source
(see also NOISE Color). Excellent for drum
sounds.
- INPUT Here the mono or stereo signal from
external analog inputs or from an internal aux
bus may be routed to the frequency modula-
tion. The input FM is in real stereo, even in
connection with UNISON mode.
KEYFOLLOW
Same as OSCILLATOR 1; see paragraph
above.
FILT ENV -> PITCH
This parameter determines the intensity at
which the filter envelope controls the pitch of
the second oscillator (PITCH OSC 2).
01111111111111111112
1 OSCILLATOR2
FltEnv~Ptch +0≤
61111111111111111154
FILT ENV -> FM
It determines the intensity at which the filter en-
velope controls the frequency modulation (FM
AMOUNT). This as well as the previous parame-
ter are "relics" from the predecessor model of