Access Virus Rack User Manual page 46

44 CHAPTER 4
Introduction
chords, especially when they are sus-
tained. To enhance this effect, activate
the LFO 1 KEY FOLLOW.
This function enables you to control the
rate of the LFOs via the pitch, or more
accurately, via the MIDI note number, so
that higher notes generate faster LFO
rates. As result, when you press and hold
several notes you will hear all kinds of
substantially different periodic fluctua-
tions.
Finally, the LFOs can also be used as addi-
tional envelopes. The control feature for
this effect is the ENV MODE button.
When you press this button, two things
occur: For one, the LFO no longer ini-
tiates its cycles periodically, but only
once at and in sync with the start of a
note, and for the other, the active range
of the LFO is switched from bipolar (in
both directions from the zero position)
to unipolar (from zero in one direction
only). Please note that this applies to the
modulation target but not the modula-
tion intensity. Here you can still deter-
mine a value in the entire bipolar range.
This effect is especially prominent when
used in conjunction with the sawtooth
wave, which enables a fade-out type of
effect (when you dial in a positive
AMOUNT value) or a volume-swell type
of effect (negative AMOUNT) for the
available modulation targets. Using the
LFO Contour encoder in the LFO section,
you can have the "ramp" rise or fall
exponentially. If you choose a triangle
for your waveshape, the device will gen-
erate an ascending phase (attack) and a
descending phase (decay). LFO Contour
also lets you determine the temporal
relationship between attack and decay;
in other words, their respective rates..
Dial in the desired speed via the RATE
encoder.
You can also use S&H and S&G in ENV
MODE to come up with some attractive
results: S&H generates a single random
value at the start of a note (in this case,
the RATE encoder has no effect); S&G
works in the same manner although in
this case the RATE value is crucial. It
determines the amount of time it takes
to glide from the previous to the new
random value.