Envelopes - Access Virus TI Serie Manual De Inicio Rápido

Envelopes

The term 'envelope' is used to describe the parts of a synthesizer we use to shape the timbre and volume of
a sound over time. The Virus TI has two envelopes, one for the Filter section and one for the Amplifier. They
both behave in exactly the same way, and are therefore equipped with the same selection of knobs.
Segment
Attack
Decay
Sustain
Release
A further parameter 'Sustain Slope' is also available to both envelopes by using SHIFT+SUSTAIN. At centre
position (+0), this will have no effect on the sound. Positive values will cause the envelope level to rise back
up to maximum once it reaches the Sustain phase. Negative values will cause the envelope to fall to zero
once the Sustain level is reached.
• Filter Envelope
Use the Filter Envelope to automatically control the cutoff frequency of one or both of the filters. For these
parameters to have any audible effect, you must first set ENV AMOUNT and CUTOFF to suitable values.
With the 'Tutorial 2' patch, turn the CUTOFF knob to 0 and ENV AMOUNT to 127.
Tip: If you want the Filter Envelope to sweep the cutoff in the opposite direction (i.e. Down>Up), enter the Fil-
ter Edit menu, and set the Env Polarity for both filters to Negative. You will probably have to find new values
for Cutoff, as well as the Filter Envelope parameters, though! For some really interesting shapes, try setting
one to Positive, and the other to Negative...
• Amplifier Envelope
Use the Amplifier Envelope to automatically control the volume of the sound. For a short, percussive sound
try: ATTACK=0, DECAY=25, SUSTAIN=0, RELEASE=25. For a long, soft pad try: ATTACK=90, DECAY=XX*,
SUSTAIN=127, RELEASE=70
Now try messing around with different shapes for both envelopes. Notice how the shape of either one can
affect your perception of the other! Understanding how the envelopes behave is is a very important part of
sound-design.
*Note that when Sustain=127 (max), the value for Decay is irrelevant.
Meaning
How fast the envelope opens when you first press the key
How fast the envelope closes to the Sustain level once the Attack phase has
completed
The level at which the envelope then remains until you release the key
How long it takes for the envelope to close completely once you release the key
PARAMETER OVERVIEW