Analogue Solutions Concussor - Manual (Page 41)

ANALOGUE SOLUTIONS
CONCUSSOR e&oe (c) 12-2007 41
EG01 - Envelope
Inputs: Outputs: Power:
Trig In +out +/-12V, GND
+/- out
Controls: Indicators: Size:
Attack Trig LED 12HP
Decay
Sustain
Release
Level with integrated push/pull switch for invert
Envelope Generators (EGs) in general
The EG produces a CV that varies over a pe ri od
of time. It’s start is triggered by a Gate or Trig ger
signal.
The main use for an EG is to vary the vol ume
of a sound, (when used to control a VCA), to re-
pro duce the way natural instruments sound. E.g.
a piano sound starting loud when the key is struck,
then gradually dieing away. It can also be used to
change the timbre of a sound over time, by con-
trol ling the cut-off frequency of a VCF.
The most common EGs are ADSR, AD and AR
(Attack, Decay, Sustain, Release). The attack time
adjusts the rate at which the envelope will rise to
its peak value. This is initiated with a Gate signal.
The Decay adjusts the rate the signal takes to fall
to the Sustain level. The Sustain level adjusts the
lev el that the EG signal will sustain from the end of
the Decay time till the end of the Gate signal (i.e.
when the key is release). The Release time adjusts
the rate the signal takes to fall from its current level
to zero, after the end of the Gate signal (when the
key was released). If a short Trigger signal is used
to initiate the EG, there will be no Decay or Sustain
portion to the EG signal. The signal will rise to peak
level (Attack), then imidiately fall from peak to zero
at the Release rate.