Access Virus Rack User Manual page 23

ACCESS VIRUS RACK 21
The Amplifier Envelope
If you turn it counter-clockwise to the
left, then the level drops off at an
increasing rate towards the minimum
level much in the manner you just expe-
rienced with the DECAY encoder; If you
turn the encoder clockwise to the right,
the level rises at an increasing rate to
maximum and remains there until you
release the key.
T he amplifier envelope can be described
as a variable curve which, depending on
the type and duration of attack, hold
and release data, automatically influ-
ences an imaginary volume encoder
(turns it up or down). At the beginning
of the note, ATTACK controls the rise or
rate of increase to the maximum level.
Once the maximum level is achieved,
DECAY determines the fall or rate of
decrease to the SUSTAIN value, which is
infinitely variable between the minimum
and maximum levels. The amplifier enve-
lope may remain at this value until the
end of the note, fall towards the mini-
mum level as determined by the variable
TIME value, or even rise again towards
the maximum level. After the end of the
note, RELEASE controls the fall or rate of
decrease to the minimum level. Conse-
quently, the control encoders labeled
ATTACK, DECAY, TIME and RELEASE con-
trol a speed or rate, where as SUSTAIN
actually controls a level.