Specifications

Audio Plug-Ins Guide460
Env 1 Controls the amount that the filter cutoff
frequency is modulated by Envelope 1. At its
center, no modulation occurs.
As the control is moved to the right, more and
more modulation occurs, moving the cutoff fre-
quency up when a MIDI note is received, then
down, following the envelope’s movement over
time.
When the control is moved left of center, the
same occurs, only the modulation is negative in-
stead of positive, so the envelope’s effect is in-
verted.
Key Trk Sets the amount that the currently play-
ing MIDI note’s pitch affects the filter’s cutoff
frequency. At zero, there is no effect. At 100%,
the frequency moves in direct relationship with
the keys played.
This is most apparent with high Res values, as
the tone created may be made to move in tan-
dem, harmonically, with the notes that are
played, thus acting almost as an additional os-
cillator, with interesting sonic possibilities.
Sat Adds saturation to the resonant feedback
loop, changing the tonal quality of the current
filter from soft to aggressive and distorted.
Vacuum Envelope Controls
Vacuum has two modulation envelopes. By de-
fault, Env One modulates each filters’ cutoff fre-
quency over time, and Env Two is used to do the
same to the amplitude of Vacuum’s output. The
envelopes can modulate other parameters, as
well. See “Vacuum Modulation Routing Con-
trols” on page 461. for more information.
Vacuum’s modulation envelopes have four main
controls, A (Attack), D (Decay), S (Sustain) and
R (Release).
Attack The amount of time it takes for the enve-
lope’s modulation to reach its highest point
when a MIDI note is received.
Decay The amount of time it takes for the enve-
lope’s modulation to move from the top of the
Attack phase to the level set by the Sustain con-
trol.
Sustain The level at which the envelope stops
while the current MIDI note is held. At zero, the
envelope drops to zero by the end of the decay
period, whether the note is held or not. At 100%,
the envelope holds at its highest point until the
note is released.
Release The amount of time it takes for the en-
velope’s modulation to drop back to zero after a
note is released. This control has no effect when
sustain is at zero.
Vel Varies the effect that incoming MIDI note
velocity has on the envelope's destination(s) (by
default Filter Cutoff for Env One and overall vol-
ume for Env Two). All the way to the left, no
change in modulation occurs.
As the Vel control is moved to the right, more
and more modulation occurs relative to incom-
ing note velocity.
Env One controls
Example Modulation Envelope